[X86] Remove unused includes (NFC) (llvm#141379)

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/Target/X86/MCTargetDesc/X86WinCOFFObjectWriter.cpp

@@ -7,7 +7,6 @@
 //===----------------------------------------------------------------------===//
 
 #include "MCTargetDesc/X86FixupKinds.h"
-#include "MCTargetDesc/X86MCExpr.h"
 #include "MCTargetDesc/X86MCTargetDesc.h"
 #include "llvm/BinaryFormat/COFF.h"
 #include "llvm/MC/MCContext.h"

llvm/lib/Target/X86/MCTargetDesc/X86WinCOFFStreamer.cpp

@@ -6,7 +6,6 @@
 //
 //===----------------------------------------------------------------------===//
 
-#include "MCTargetDesc/X86MCExpr.h"
 #include "X86MCTargetDesc.h"
 #include "X86TargetStreamer.h"
 #include "llvm/MC/MCAsmBackend.h"

llvm/lib/Target/X86/MCTargetDesc/X86WinCOFFTargetStreamer.cpp

@@ -6,7 +6,6 @@
 //
 //===----------------------------------------------------------------------===//
 
-#include "MCTargetDesc/X86MCExpr.h"
 #include "X86MCTargetDesc.h"
 #include "X86TargetStreamer.h"
 #include "llvm/DebugInfo/CodeView/CodeView.h"

llvm/lib/Target/X86/X86ArgumentStackSlotRebase.cpp

@@ -26,7 +26,6 @@
 #include "llvm/CodeGen/TargetSubtargetInfo.h"
 #include "llvm/IR/Attributes.h"
 #include "llvm/IR/Function.h"
-#include "llvm/InitializePasses.h"
 #include "llvm/Pass.h"
 
 using namespace llvm;

llvm/lib/Target/X86/X86SuppressAPXForReloc.cpp

@@ -25,9 +25,7 @@
 #include "llvm/CodeGen/MachineRegisterInfo.h"
 #include "llvm/CodeGen/Passes.h"
 #include "llvm/CodeGen/TargetRegisterInfo.h"
-#include "llvm/InitializePasses.h"
 #include "llvm/Support/ErrorHandling.h"
-#include "llvm/Target/TargetMachine.h"
 
 using namespace llvm;
 

llvm/lib/Target/X86/X86TargetMachine.cpp

@@ -27,7 +27,6 @@
 #include "llvm/CodeGen/GlobalISel/CallLowering.h"
 #include "llvm/CodeGen/GlobalISel/IRTranslator.h"
 #include "llvm/CodeGen/GlobalISel/InstructionSelect.h"
-#include "llvm/CodeGen/GlobalISel/InstructionSelector.h"
 #include "llvm/CodeGen/GlobalISel/Legalizer.h"
 #include "llvm/CodeGen/GlobalISel/RegBankSelect.h"
 #include "llvm/CodeGen/MIRParser/MIParser.h"