[ARM] Simplify ExpandPseudoInst. NFC.

[javed.absar]

Summary

Remove headers not required and convert to range-loop

[mcrosier]

LGTM.

lib/Target/ARM/ARMExpandPseudoInsts.cpp

 #include "ARMBaseRegisterInfo.h"
 #include "ARMConstantPoolValue.h"
 #include "ARMMachineFunctionInfo.h"
 #include "ARMSubtarget.h"
 #include "MCTargetDesc/ARMAddressingModes.h"
 #include "llvm/CodeGen/LivePhysRegs.h"
 #include "llvm/CodeGen/MachineFrameInfo.h"
 #include "llvm/CodeGen/MachineFunctionPass.h"
-#include "llvm/CodeGen/MachineInstrBuilder.h"
-#include "llvm/CodeGen/MachineInstrBundle.h"
-#include "llvm/IR/GlobalValue.h"
-#include "llvm/Support/CommandLine.h"
-#include "llvm/Support/raw_ostream.h" // FIXME: for debug only. remove!
-#include "llvm/Target/TargetFrameLowering.h"
-#include "llvm/Target/TargetRegisterInfo.h"
 
 using namespace llvm;
 
 #define DEBUG_TYPE "arm-pseudo"
 
 static cl::opt<bool>
 VerifyARMPseudo("verify-arm-pseudo-expand", cl::Hidden,
                 cl::desc("Verify machine code after expanding ARM pseudos"));

 
 bool ARMExpandPseudo::runOnMachineFunction(MachineFunction &MF) {
   STI = &static_cast<const ARMSubtarget &>(MF.getSubtarget());
   TII = STI->getInstrInfo();
   TRI = STI->getRegisterInfo();
   AFI = MF.getInfo<ARMFunctionInfo>();
 
   bool Modified = false;
-  for (MachineFunction::iterator MFI = MF.begin(), E = MF.end(); MFI != E;
-       ++MFI)
-    Modified |= ExpandMBB(*MFI);
+  for (MachineBasicBlock &MBB : MF)
+    Modified |= ExpandMBB(MBB);
   if (VerifyARMPseudo)
     MF.verify(this, "After expanding ARM pseudo instructions.");
   return Modified;
 }
 
 /// createARMExpandPseudoPass - returns an instance of the pseudo instruction
 /// expansion pass.
 FunctionPass *llvm::createARMExpandPseudoPass() {
   return new ARMExpandPseudo();
 }