Pull in r181620 from llvm trunk:

  [ms-inline asm] Fix a crasher when we fail on a direct match.

  The issue was that the MatchingInlineAsm and VariantID args to the
  MatchInstructionImpl function weren't being set properly.  Specifically, when
  parsing intel syntax, the parser thought it was parsing inline assembly in the
  at&t dialect; that will never be the case.

  The crash was caused when the emitter tried to emit the instruction, but the
  operands weren't set.  When parsing inline assembly we only set the opcode, not
  the operands, which is used to lookup the instruction descriptor.
  rdar://13854391 and PR15945

  Also, this commit reverts r176036.  Now that we're correctly parsing the intel
  syntax the pushad/popad don't match properly.  I've reimplemented that fix using
  a MnemonicAlias.

Pull in r183907 from llvm trunk:

  X86: Make the cmov aliases work with intel syntax too.

These commits make a number of Intel-style inline assembly mnemonics
aliases (occurring in several ports) work properly, which could cause
assertions otherwise.

Reported by:	kwm, bapt

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