[PATCH] [X86] Special-case 2x CMOV when custom-inserting.

[Ahmed Bougacha]

Hi MatzeB,

Follow-up to http://reviews.llvm.org/D7634.

This lets us avoid a few copies that are otherwise hard to get rid of.  My first approach was to add a CMOV2 node, but after discussing with Matthias, we agreed it's less hacky to teach the custom inserter to look at the next instruction.  Mentioned that explicitly in the EmitWithCustomInserter comment.

-Ahmed

http://reviews.llvm.org/D8019

Files:
  include/llvm/Target/TargetLowering.h
  lib/Target/X86/X86ISelLowering.cpp
  test/CodeGen/X86/cmovcmov.ll

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