[PATCH] x86: Emit LOCK prefix after DATA16

[JF Bastien]

Hi craig.topper, jvoung,

x86 allows either ordering for the LOCK and DATA16 prefixes, but using GCC+GAS leads to different code generation than using LLVM. This change matches the order that GAS emits the x86 prefixes when a semicolon isn't used in inline assembly (see tc-i386.c comment before define LOCK_PREFIX), and helps simplify tooling that operates on the instruction's byte sequence (such as NaCl's validator). This change shouldn't have any performance impact.

http://reviews.llvm.org/D6630

Files:
  lib/Target/X86/MCTargetDesc/X86MCCodeEmitter.cpp
  test/CodeGen/X86/atomic16.ll

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