[PATCH] Further relax the constraint on atomics in MemoryDependencyAnalysis.cpp

[Robin Morisset]

Mostly add to the big comment, and improve a bit the tests.

http://reviews.llvm.org/D4845

Files:
  lib/Analysis/MemoryDependenceAnalysis.cpp
  test/Transforms/DeadStoreElimination/atomic.ll
  test/Transforms/GVN/atomic.ll
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