[PATCH] [X86] Make wide loads be managed by AtomicExpand

[Robin Morisset]

Preserve FIXME comment, and refine tests.

http://reviews.llvm.org/D5404

Files:
  lib/CodeGen/AtomicExpandPass.cpp
  lib/Target/X86/X86ISelLowering.cpp
  test/CodeGen/X86/atomic-load-store-wide.ll
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