[ARM] Fix some Include What You Use warnings; other minor fixes (NFC).

This is preparation to reduce MCExpr.h dependencies.

llvm-svn: 294052

llvm/lib/Target/ARM/InstPrinter/ARMInstPrinter.cpp

@@ -20,7 +20,15 @@
 #include "llvm/MC/MCInstrInfo.h"
 #include "llvm/MC/MCRegisterInfo.h"
 #include "llvm/MC/MCSubtargetInfo.h"
+#include "llvm/MC/SubtargetFeature.h"
+#include "llvm/Support/Casting.h"
+#include "llvm/Support/ErrorHandling.h"
+#include "llvm/Support/MathExtras.h"
 #include "llvm/Support/raw_ostream.h"
+#include <algorithm>
+#include <cassert>
+#include <cstdint>
+
 using namespace llvm;
 
 #define DEBUG_TYPE "asm-printer"
@@ -73,7 +81,6 @@ void ARMInstPrinter::printInst(const MCInst *MI, raw_ostream &O,
   unsigned Opcode = MI->getOpcode();
 
   switch (Opcode) {
-
   // Check for MOVs and print canonical forms, instead.
   case ARM::MOVsr: {
     // FIXME: Thumb variants?

llvm/lib/Target/ARM/InstPrinter/ARMInstPrinter.h

@@ -235,4 +235,4 @@ public:
 
 } // end namespace llvm
 
-#endif
+#endif // LLVM_LIB_TARGET_ARM_INSTPRINTER_ARMINSTPRINTER_H