[PATCH] [X86] Don't transform atomic-load-add into an inc/dec when inc/dec is slow

[Robin Morisset]

Hi jfb, nadav,

I had to move code around and turn a static function into a method to get
access to Subtarget, but the only "real" change is the extra check for
!Subtarget->slowIncDec().

http://reviews.llvm.org/D5678

Files:
  lib/Target/X86/X86ISelDAGToDAG.cpp
  test/CodeGen/X86/atomic_add.ll
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