X86InstrFMA3Info.h - remove unnecessary includes. NFC.

There were a number of cpp files explicitly relying on X86InstrFMA3Info.h to include the X86.h header - so I've had to add it locally.

llvm/lib/Target/X86/X86AvoidStoreForwardingBlocks.cpp

@@ -33,6 +33,7 @@
 // transformation done here is correct regardless to other memory accesses.
 //===----------------------------------------------------------------------===//
 
+#include "X86.h"
 #include "X86InstrInfo.h"
 #include "X86Subtarget.h"
 #include "llvm/Analysis/AliasAnalysis.h"

llvm/lib/Target/X86/X86CallFrameOptimization.cpp

@@ -17,6 +17,7 @@
 //===----------------------------------------------------------------------===//
 
 #include "MCTargetDesc/X86BaseInfo.h"
+#include "X86.h"
 #include "X86FrameLowering.h"
 #include "X86InstrInfo.h"
 #include "X86MachineFunctionInfo.h"

llvm/lib/Target/X86/X86ISelLowering.cpp

@@ -13,6 +13,7 @@
 
 #include "X86ISelLowering.h"
 #include "MCTargetDesc/X86ShuffleDecode.h"
+#include "X86.h"
 #include "X86CallingConv.h"
 #include "X86FrameLowering.h"
 #include "X86InstrBuilder.h"

llvm/lib/Target/X86/X86InstrFMA3Info.h

@@ -14,11 +14,7 @@
 #ifndef LLVM_LIB_TARGET_X86_UTILS_X86INSTRFMA3INFO_H
 #define LLVM_LIB_TARGET_X86_UTILS_X86INSTRFMA3INFO_H
 
-#include "X86.h"
-#include "llvm/ADT/DenseMap.h"
-#include <cassert>
 #include <cstdint>
-#include <set>
 
 namespace llvm {
 

llvm/lib/Target/X86/X86InstructionSelector.cpp

@@ -12,6 +12,7 @@
 //===----------------------------------------------------------------------===//
 
 #include "MCTargetDesc/X86BaseInfo.h"
+#include "X86.h"
 #include "X86InstrBuilder.h"
 #include "X86InstrInfo.h"
 #include "X86RegisterBankInfo.h"