[PATCH] [X86] Fix a bug with fetch_add(INT32_MIN)

[Robin Morisset]

Based on an offline comment by jf, improve the patch so that the immediate is
merged into the addq.

http://reviews.llvm.org/D5655

Files:
  lib/Target/X86/X86ISelDAGToDAG.cpp
  test/CodeGen/X86/pr21099.ll
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