[PATCH] [X86] replace (atomic fetch_add of 0) by (mfence; mov)

[Robin Morisset]

Fixed formatting.

Thanks David for suggesting the use of clang-format.

http://reviews.llvm.org/D5091

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