[PATCH] [SROA] Fix for PR23737: Handle Atomic when rewriting Loads and Stores

[Philip Pfaffe]

Hi chandlerc,

SROA currently ignores loads and stores being atomic. When rewriting instructions, copy the atomic property to the new instructions. 

Concerning integer- or vector-promotion, treat atomic like volatile and don't promote.

REPOSITORY
  rL LLVM

http://reviews.llvm.org/D10276

Files:
  lib/Transforms/Scalar/SROA.cpp
  test/Transforms/SROA/atomic.ll

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