[llvm] Remove unused includes (NFC) (#144941)

These are identified by misc-include-cleaner.  I've filtered out those
that break builds.  Also, I'm staying away from llvm-config.h,
config.h, and Compiler.h, which likely cause platform- or
compiler-specific build failures.

Author: kazutakahirata

llvm/lib/ExecutionEngine/JITLink/COFFDirectiveParser.cpp

@@ -12,8 +12,6 @@
 
 #include "COFFDirectiveParser.h"
 
-#include <array>
-
 using namespace llvm;
 using namespace jitlink;
 

llvm/lib/ExecutionEngine/Orc/UnwindInfoRegistrationPlugin.cpp

@@ -8,10 +8,8 @@
 
 #include "llvm/ExecutionEngine/Orc/UnwindInfoRegistrationPlugin.h"
 
-#include "llvm/ADT/ScopeExit.h"
 #include "llvm/ExecutionEngine/Orc/Shared/MachOObjectFormat.h"
 #include "llvm/ExecutionEngine/Orc/Shared/OrcRTBridge.h"
-#include "llvm/IR/IRBuilder.h"
 #include "llvm/IR/Module.h"
 
 #define DEBUG_TYPE "orc"

llvm/lib/Linker/IRMover.cpp

@@ -9,7 +9,6 @@
 #include "llvm/Linker/IRMover.h"
 #include "LinkDiagnosticInfo.h"
 #include "llvm/ADT/SetVector.h"
-#include "llvm/ADT/SmallPtrSet.h"
 #include "llvm/ADT/SmallString.h"
 #include "llvm/IR/AutoUpgrade.h"
 #include "llvm/IR/Constants.h"

llvm/lib/Target/BPF/BPFPreserveStaticOffset.cpp

@@ -108,7 +108,6 @@
 #include "llvm/IR/Attributes.h"
 #include "llvm/IR/BasicBlock.h"
 #include "llvm/IR/Constants.h"
-#include "llvm/IR/DebugInfoMetadata.h"
 #include "llvm/IR/DiagnosticInfo.h"
 #include "llvm/IR/IRBuilder.h"
 #include "llvm/IR/InstIterator.h"