[CodeGen] Remove unused includes (NFC) (llvm#141320)

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/CodeGen/AsmPrinter/DwarfDebug.cpp

@@ -17,7 +17,6 @@
 #include "DwarfExpression.h"
 #include "DwarfUnit.h"
 #include "llvm/ADT/APInt.h"
-#include "llvm/ADT/ScopeExit.h"
 #include "llvm/ADT/Statistic.h"
 #include "llvm/ADT/StringExtras.h"
 #include "llvm/ADT/Twine.h"
@@ -55,7 +54,6 @@
 #include "llvm/Target/TargetLoweringObjectFile.h"
 #include "llvm/Target/TargetMachine.h"
 #include "llvm/TargetParser/Triple.h"
-#include <algorithm>
 #include <cstddef>
 #include <iterator>
 #include <optional>

llvm/lib/CodeGen/AsmPrinter/WinCFGuard.cpp

@@ -15,7 +15,6 @@
 #include "llvm/CodeGen/AsmPrinter.h"
 #include "llvm/CodeGen/MachineFunction.h"
 #include "llvm/CodeGen/MachineModuleInfo.h"
-#include "llvm/IR/Constants.h"
 #include "llvm/IR/InstrTypes.h"
 #include "llvm/IR/Module.h"
 #include "llvm/MC/MCObjectFileInfo.h"

llvm/lib/CodeGen/CFIFixup.cpp

@@ -80,7 +80,6 @@
 #include "llvm/CodeGen/TargetSubtargetInfo.h"
 #include "llvm/MC/MCAsmInfo.h"
 #include "llvm/MC/MCDwarf.h"
-#include "llvm/Support/CodeGen.h"
 #include "llvm/Target/TargetMachine.h"
 
 #include <iterator>

llvm/lib/CodeGen/GlobalISel/CombinerHelperArtifacts.cpp

@@ -18,7 +18,6 @@
 #include "llvm/CodeGen/GlobalISel/LegalizerInfo.h"
 #include "llvm/CodeGen/GlobalISel/MachineIRBuilder.h"
 #include "llvm/CodeGen/GlobalISel/Utils.h"
-#include "llvm/CodeGen/LowLevelTypeUtils.h"
 #include "llvm/CodeGen/MachineOperand.h"
 #include "llvm/CodeGen/MachineRegisterInfo.h"
 #include "llvm/CodeGen/TargetOpcodes.h"

llvm/lib/CodeGen/InlineSpiller.cpp

@@ -30,7 +30,6 @@
 #include "llvm/CodeGen/MachineBlockFrequencyInfo.h"
 #include "llvm/CodeGen/MachineDominators.h"
 #include "llvm/CodeGen/MachineFunction.h"
-#include "llvm/CodeGen/MachineFunctionPass.h"
 #include "llvm/CodeGen/MachineInstr.h"
 #include "llvm/CodeGen/MachineInstrBuilder.h"
 #include "llvm/CodeGen/MachineInstrBundle.h"

llvm/lib/CodeGen/LiveVariables.cpp

@@ -38,7 +38,6 @@
 #include "llvm/Support/Debug.h"
 #include "llvm/Support/ErrorHandling.h"
 #include "llvm/Support/raw_ostream.h"
-#include <algorithm>
 using namespace llvm;
 
 AnalysisKey LiveVariablesAnalysis::Key;

llvm/lib/CodeGen/MachineBasicBlock.cpp

@@ -22,7 +22,6 @@
 #include "llvm/CodeGen/MachineInstrBuilder.h"
 #include "llvm/CodeGen/MachineJumpTableInfo.h"
 #include "llvm/CodeGen/MachineLoopInfo.h"
-#include "llvm/CodeGen/MachinePostDominators.h"
 #include "llvm/CodeGen/MachineRegisterInfo.h"
 #include "llvm/CodeGen/SlotIndexes.h"
 #include "llvm/CodeGen/TargetInstrInfo.h"

llvm/lib/CodeGen/MachineDominators.cpp

@@ -12,7 +12,6 @@
 //===----------------------------------------------------------------------===//
 
 #include "llvm/CodeGen/MachineDominators.h"
-#include "llvm/ADT/SmallBitVector.h"
 #include "llvm/CodeGen/Passes.h"
 #include "llvm/InitializePasses.h"
 #include "llvm/Pass.h"

llvm/lib/CodeGen/MachineLICM.cpp

@@ -44,7 +44,6 @@
 #include "llvm/InitializePasses.h"
 #include "llvm/MC/MCInstrDesc.h"
 #include "llvm/MC/MCRegister.h"
-#include "llvm/MC/MCRegisterInfo.h"
 #include "llvm/Pass.h"
 #include "llvm/Support/Casting.h"
 #include "llvm/Support/CommandLine.h"

llvm/lib/CodeGen/MachinePipeliner.cpp

@@ -33,7 +33,6 @@
 #include "llvm/ADT/ArrayRef.h"
 #include "llvm/ADT/BitVector.h"
 #include "llvm/ADT/DenseMap.h"
-#include "llvm/ADT/MapVector.h"
 #include "llvm/ADT/PriorityQueue.h"
 #include "llvm/ADT/STLExtras.h"
 #include "llvm/ADT/SetOperations.h"