diff --git a/llvm/include/llvm/Passes/StandardInstrumentations.h b/llvm/include/llvm/Passes/StandardInstrumentations.h
index 80eedc52bc324..fa9c744294a66 100644
--- a/llvm/include/llvm/Passes/StandardInstrumentations.h
+++ b/llvm/include/llvm/Passes/StandardInstrumentations.h
@@ -171,7 +171,7 @@ class PreservedCFGCheckerInstrumentation {
                     FunctionAnalysisManager::Invalidator &);
   };
 
-#if LLVM_ENABLE_ABI_BREAKING_CHECKS
+#ifdef LLVM_ENABLE_ABI_BREAKING_CHECKS
   SmallVector<StringRef, 8> PassStack;
 #endif
 
diff --git a/llvm/include/llvm/Support/GenericDomTreeConstruction.h b/llvm/include/llvm/Support/GenericDomTreeConstruction.h
index 2e21bdc9fce2d..9aab5ec60f4a2 100644
--- a/llvm/include/llvm/Support/GenericDomTreeConstruction.h
+++ b/llvm/include/llvm/Support/GenericDomTreeConstruction.h
@@ -640,7 +640,7 @@ struct SemiNCAInfo {
         Bucket;
     SmallDenseSet<TreeNodePtr, 8> Visited;
     SmallVector<TreeNodePtr, 8> Affected;
-#if LLVM_ENABLE_ABI_BREAKING_CHECKS
+#ifdef LLVM_ENABLE_ABI_BREAKING_CHECKS
     SmallVector<TreeNodePtr, 8> VisitedUnaffected;
 #endif
   };
@@ -915,7 +915,7 @@ struct SemiNCAInfo {
     LLVM_DEBUG(dbgs() << "Deleting edge " << BlockNamePrinter(From) << " -> "
                       << BlockNamePrinter(To) << "\n");
 
-#if LLVM_ENABLE_ABI_BREAKING_CHECKS
+#ifdef LLVM_ENABLE_ABI_BREAKING_CHECKS
     // Ensure that the edge was in fact deleted from the CFG before informing
     // the DomTree about it.
     // The check is O(N), so run it only in debug configuration.
diff --git a/llvm/include/llvm/Transforms/Scalar/LoopPassManager.h b/llvm/include/llvm/Transforms/Scalar/LoopPassManager.h
index db479f55d9b03..3858be05c61fa 100644
--- a/llvm/include/llvm/Transforms/Scalar/LoopPassManager.h
+++ b/llvm/include/llvm/Transforms/Scalar/LoopPassManager.h
@@ -256,7 +256,7 @@ class LPMUpdater {
   }
 
   void setParentLoop(Loop *L) {
-#if LLVM_ENABLE_ABI_BREAKING_CHECKS
+#ifdef LLVM_ENABLE_ABI_BREAKING_CHECKS
     ParentL = L;
 #endif
   }
@@ -347,7 +347,7 @@ class LPMUpdater {
   const bool LoopNestMode;
   bool LoopNestChanged;
 
-#if LLVM_ENABLE_ABI_BREAKING_CHECKS
+#ifdef LLVM_ENABLE_ABI_BREAKING_CHECKS
   // In debug builds we also track the parent loop to implement asserts even in
   // the face of loop deletion.
   Loop *ParentL;
diff --git a/llvm/include/llvm/Transforms/Utils/ScalarEvolutionExpander.h b/llvm/include/llvm/Transforms/Utils/ScalarEvolutionExpander.h
index 468b50092efcf..62c1e15a9a60e 100644
--- a/llvm/include/llvm/Transforms/Utils/ScalarEvolutionExpander.h
+++ b/llvm/include/llvm/Transforms/Utils/ScalarEvolutionExpander.h
@@ -167,7 +167,7 @@ class SCEVExpander : public SCEVVisitor<SCEVExpander, Value *> {
   /// consistent when instructions are moved.
   SmallVector<SCEVInsertPointGuard *, 8> InsertPointGuards;
 
-#if LLVM_ENABLE_ABI_BREAKING_CHECKS
+#ifdef LLVM_ENABLE_ABI_BREAKING_CHECKS
   const char *DebugType;
 #endif
 
@@ -183,7 +183,7 @@ class SCEVExpander : public SCEVVisitor<SCEVExpander, Value *> {
         Builder(se.getContext(), InstSimplifyFolder(DL),
                 IRBuilderCallbackInserter(
                     [this](Instruction *I) { rememberInstruction(I); })) {
-#if LLVM_ENABLE_ABI_BREAKING_CHECKS
+#ifdef LLVM_ENABLE_ABI_BREAKING_CHECKS
     DebugType = "";
 #endif
   }
@@ -193,7 +193,7 @@ class SCEVExpander : public SCEVVisitor<SCEVExpander, Value *> {
     assert(InsertPointGuards.empty());
   }
 
-#if LLVM_ENABLE_ABI_BREAKING_CHECKS
+#ifdef LLVM_ENABLE_ABI_BREAKING_CHECKS
   void setDebugType(const char *s) { DebugType = s; }
 #endif
 
diff --git a/llvm/lib/Passes/StandardInstrumentations.cpp b/llvm/lib/Passes/StandardInstrumentations.cpp
index a545ae5862397..036484c9c1c0c 100644
--- a/llvm/lib/Passes/StandardInstrumentations.cpp
+++ b/llvm/lib/Passes/StandardInstrumentations.cpp
@@ -1357,7 +1357,7 @@ void PreservedCFGCheckerInstrumentation::registerCallbacks(
   bool Registered = false;
   PIC.registerBeforeNonSkippedPassCallback([this, &MAM, Registered](
                                                StringRef P, Any IR) mutable {
-#if LLVM_ENABLE_ABI_BREAKING_CHECKS
+#ifdef LLVM_ENABLE_ABI_BREAKING_CHECKS
     assert(&PassStack.emplace_back(P));
 #endif
     (void)this;
@@ -1386,7 +1386,7 @@ void PreservedCFGCheckerInstrumentation::registerCallbacks(
 
   PIC.registerAfterPassInvalidatedCallback(
       [this](StringRef P, const PreservedAnalyses &PassPA) {
-#if LLVM_ENABLE_ABI_BREAKING_CHECKS
+#ifdef LLVM_ENABLE_ABI_BREAKING_CHECKS
         assert(PassStack.pop_back_val() == P &&
                "Before and After callbacks must correspond");
 #endif
@@ -1395,7 +1395,7 @@ void PreservedCFGCheckerInstrumentation::registerCallbacks(
 
   PIC.registerAfterPassCallback([this, &MAM](StringRef P, Any IR,
                                              const PreservedAnalyses &PassPA) {
-#if LLVM_ENABLE_ABI_BREAKING_CHECKS
+#ifdef LLVM_ENABLE_ABI_BREAKING_CHECKS
     assert(PassStack.pop_back_val() == P &&
            "Before and After callbacks must correspond");
 #endif
diff --git a/llvm/lib/Transforms/Utils/ScalarEvolutionExpander.cpp b/llvm/lib/Transforms/Utils/ScalarEvolutionExpander.cpp
index 2119320566902..0927a3015818f 100644
--- a/llvm/lib/Transforms/Utils/ScalarEvolutionExpander.cpp
+++ b/llvm/lib/Transforms/Utils/ScalarEvolutionExpander.cpp
@@ -28,7 +28,7 @@
 #include "llvm/Support/raw_ostream.h"
 #include "llvm/Transforms/Utils/LoopUtils.h"
 
-#if LLVM_ENABLE_ABI_BREAKING_CHECKS
+#ifdef LLVM_ENABLE_ABI_BREAKING_CHECKS
 #define SCEV_DEBUG_WITH_TYPE(TYPE, X) DEBUG_WITH_TYPE(TYPE, X)
 #else
 #define SCEV_DEBUG_WITH_TYPE(TYPE, X)
diff --git a/mlir/include/mlir/Analysis/Presburger/PresburgerSpace.h b/mlir/include/mlir/Analysis/Presburger/PresburgerSpace.h
index 97573b6e45301..cff7957989871 100644
--- a/mlir/include/mlir/Analysis/Presburger/PresburgerSpace.h
+++ b/mlir/include/mlir/Analysis/Presburger/PresburgerSpace.h
@@ -75,7 +75,7 @@ class Identifier {
   template <typename T>
   explicit Identifier(T value)
       : value(llvm::PointerLikeTypeTraits<T>::getAsVoidPointer(value)) {
-#if LLVM_ENABLE_ABI_BREAKING_CHECKS
+#ifdef LLVM_ENABLE_ABI_BREAKING_CHECKS
     idType = llvm::getTypeName<T>();
 #endif
   }
@@ -84,7 +84,7 @@ class Identifier {
   /// the type of the identifier used to create it.
   template <typename T>
   T getValue() const {
-#if LLVM_ENABLE_ABI_BREAKING_CHECKS
+#ifdef LLVM_ENABLE_ABI_BREAKING_CHECKS
     assert(llvm::getTypeName<T>() == idType &&
            "Identifier was initialized with a different type than the one used "
            "to retrieve it.");
@@ -108,7 +108,7 @@ class Identifier {
   /// The value of the identifier.
   void *value = nullptr;
 
-#if LLVM_ENABLE_ABI_BREAKING_CHECKS
+#ifdef LLVM_ENABLE_ABI_BREAKING_CHECKS
   /// TypeID of the identifiers in space. This should be used in asserts only.
   llvm::StringRef idType;
 #endif
diff --git a/mlir/include/mlir/Dialect/Transform/Interfaces/TransformInterfaces.h b/mlir/include/mlir/Dialect/Transform/Interfaces/TransformInterfaces.h
index e51aac02936b5..43193e4cd4cf6 100644
--- a/mlir/include/mlir/Dialect/Transform/Interfaces/TransformInterfaces.h
+++ b/mlir/include/mlir/Dialect/Transform/Interfaces/TransformInterfaces.h
@@ -196,7 +196,7 @@ class TransformState {
   /// should be emitted when the value is used.
   using InvalidatedHandleMap = DenseMap<Value, std::function<void(Location)>>;
 
-#if LLVM_ENABLE_ABI_BREAKING_CHECKS
+#ifdef LLVM_ENABLE_ABI_BREAKING_CHECKS
   /// Debug only: A timestamp is associated with each transform IR value, so
   /// that invalid iterator usage can be detected more reliably.
   using TransformIRTimestampMapping = DenseMap<Value, int64_t>;
@@ -211,7 +211,7 @@ class TransformState {
     ValueMapping values;
     ValueMapping reverseValues;
 
-#if LLVM_ENABLE_ABI_BREAKING_CHECKS
+#ifdef LLVM_ENABLE_ABI_BREAKING_CHECKS
     TransformIRTimestampMapping timestamps;
     void incrementTimestamp(Value value) { ++timestamps[value]; }
 #endif // LLVM_ENABLE_ABI_BREAKING_CHECKS
@@ -248,7 +248,7 @@ class TransformState {
   auto getPayloadOps(Value value) const {
     ArrayRef<Operation *> view = getPayloadOpsView(value);
 
-#if LLVM_ENABLE_ABI_BREAKING_CHECKS
+#ifdef LLVM_ENABLE_ABI_BREAKING_CHECKS
     // Memorize the current timestamp and make sure that it has not changed
     // when incrementing or dereferencing the iterator returned by this
     // function. The timestamp is incremented when the "direct" mapping is
@@ -259,7 +259,7 @@ class TransformState {
     // When ops are replaced/erased, they are replaced with nullptr (until
     // the data structure is compacted). Do not enumerate these ops.
     return llvm::make_filter_range(view, [=](Operation *op) {
-#if LLVM_ENABLE_ABI_BREAKING_CHECKS
+#ifdef LLVM_ENABLE_ABI_BREAKING_CHECKS
       [[maybe_unused]] bool sameTimestamp =
           currentTimestamp == this->getMapping(value).timestamps.lookup(value);
       assert(sameTimestamp && "iterator was invalidated during iteration");
@@ -277,7 +277,7 @@ class TransformState {
   auto getPayloadValues(Value handleValue) const {
     ArrayRef<Value> view = getPayloadValuesView(handleValue);
 
-#if LLVM_ENABLE_ABI_BREAKING_CHECKS
+#ifdef LLVM_ENABLE_ABI_BREAKING_CHECKS
     // Memorize the current timestamp and make sure that it has not changed
     // when incrementing or dereferencing the iterator returned by this
     // function. The timestamp is incremented when the "values" mapping is
diff --git a/mlir/lib/Dialect/Transform/Interfaces/TransformInterfaces.cpp b/mlir/lib/Dialect/Transform/Interfaces/TransformInterfaces.cpp
index fdd968238667e..91702ce7cc42b 100644
--- a/mlir/lib/Dialect/Transform/Interfaces/TransformInterfaces.cpp
+++ b/mlir/lib/Dialect/Transform/Interfaces/TransformInterfaces.cpp
@@ -330,7 +330,7 @@ void transform::TransformState::forgetMapping(Value opHandle,
   for (Operation *op : mappings.direct[opHandle])
     dropMappingEntry(mappings.reverse, op, opHandle);
   mappings.direct.erase(opHandle);
-#if LLVM_ENABLE_ABI_BREAKING_CHECKS
+#ifdef LLVM_ENABLE_ABI_BREAKING_CHECKS
   // Payload IR is removed from the mapping. This invalidates the respective
   // iterators.
   mappings.incrementTimestamp(opHandle);
@@ -342,7 +342,7 @@ void transform::TransformState::forgetMapping(Value opHandle,
     for (Value resultHandle : resultHandles) {
       Mappings &localMappings = getMapping(resultHandle);
       dropMappingEntry(localMappings.values, resultHandle, opResult);
-#if LLVM_ENABLE_ABI_BREAKING_CHECKS
+#ifdef LLVM_ENABLE_ABI_BREAKING_CHECKS
       // Payload IR is removed from the mapping. This invalidates the respective
       // iterators.
       mappings.incrementTimestamp(resultHandle);
@@ -358,7 +358,7 @@ void transform::TransformState::forgetValueMapping(
   for (Value payloadValue : mappings.reverseValues[valueHandle])
     dropMappingEntry(mappings.reverseValues, payloadValue, valueHandle);
   mappings.values.erase(valueHandle);
-#if LLVM_ENABLE_ABI_BREAKING_CHECKS
+#ifdef LLVM_ENABLE_ABI_BREAKING_CHECKS
   // Payload IR is removed from the mapping. This invalidates the respective
   // iterators.
   mappings.incrementTimestamp(valueHandle);
@@ -372,7 +372,7 @@ void transform::TransformState::forgetValueMapping(
       dropMappingEntry(localMappings.direct, opHandle, payloadOp);
       dropMappingEntry(localMappings.reverse, payloadOp, opHandle);
 
-#if LLVM_ENABLE_ABI_BREAKING_CHECKS
+#ifdef LLVM_ENABLE_ABI_BREAKING_CHECKS
       // Payload IR is removed from the mapping. This invalidates the respective
       // iterators.
       localMappings.incrementTimestamp(opHandle);
@@ -452,7 +452,7 @@ transform::TransformState::replacePayloadValue(Value value, Value replacement) {
     // between the handles and the IR objects
     if (!replacement) {
       dropMappingEntry(mappings.values, handle, value);
-#if LLVM_ENABLE_ABI_BREAKING_CHECKS
+#ifdef LLVM_ENABLE_ABI_BREAKING_CHECKS
       // Payload IR is removed from the mapping. This invalidates the respective
       // iterators.
       mappings.incrementTimestamp(handle);
@@ -804,7 +804,7 @@ checkRepeatedConsumptionInOperand(ArrayRef<T> payload,
 void transform::TransformState::compactOpHandles() {
   for (Value handle : opHandlesToCompact) {
     Mappings &mappings = getMapping(handle, /*allowOutOfScope=*/true);
-#if LLVM_ENABLE_ABI_BREAKING_CHECKS
+#ifdef LLVM_ENABLE_ABI_BREAKING_CHECKS
     if (llvm::find(mappings.direct[handle], nullptr) !=
         mappings.direct[handle].end())
       // Payload IR is removed from the mapping. This invalidates the respective