Ensure whenever CSE's DenseMapInfo's isEqual is true, hash codes of its inputs are same

Author: meg-gupta

lib/SILOptimizer/Transforms/CSE.cpp

@@ -516,7 +516,10 @@ bool llvm::DenseMapInfo<SimpleValue>::isEqual(SimpleValue LHS,
       return true;
     return false;
   };
-  return LHSI->getKind() == RHSI->getKind() && LHSI->isIdenticalTo(RHSI, opCmp);
+  bool isEqual =
+      LHSI->getKind() == RHSI->getKind() && LHSI->isIdenticalTo(RHSI, opCmp);
+  assert(!isEqual || getHashValue(LHS) == getHashValue(RHS));
+  return isEqual;
 }
 
 namespace {