[PATCH] X86_64 target now obeys llc -disable-red-zone option

[Steve King]

X86_64 enables red zone optimization regardless of llc -disable-red-zone command line flag.  This patch corrects this with a target option flag checked in X86FrameLowering::emitPrologue().  The existing x86_64 red-zone regression test is extended to check for this case.

http://reviews.llvm.org/D5681

Files:
  include/llvm/CodeGen/CommandFlags.h
  include/llvm/Target/TargetOptions.h
  lib/Target/X86/X86FrameLowering.cpp
  test/CodeGen/X86/red-zone.ll
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