[PATCH] Add HLE encoding/assembler support

[darkbuck]

  this patch is rebased on the trunk and revised after the change replacing TargetFlags to HLEHint

Hi nadav, jfifield, chandlerc, hfinkel, eli.friedman,

http://llvm-reviews.chandlerc.com/D438

CHANGE SINCE LAST DIFF
  http://llvm-reviews.chandlerc.com/D438?vs=1054&id=1143#toc

Files:
  lib/Target/X86/AsmParser/X86AsmParser.cpp
  lib/Target/X86/InstPrinter/X86ATTInstPrinter.cpp
  lib/Target/X86/InstPrinter/X86IntelInstPrinter.cpp
  lib/Target/X86/MCTargetDesc/X86BaseInfo.h
  lib/Target/X86/MCTargetDesc/X86MCCodeEmitter.cpp
  lib/Target/X86/X86InstrFormats.td
  lib/Target/X86/X86InstrInfo.td
  test/MC/X86/x86_64-hle-encoding.s
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