[PATCH] Sink store based on alias analysis

[Ella Bolshinsky]

Applied hfinkel's comments

http://reviews.llvm.org/D6420

Files:
  include/llvm/Analysis/AliasAnalysis.h
  lib/Analysis/AliasAnalysis.cpp
  lib/Transforms/IPO/ArgumentPromotion.cpp
  lib/Transforms/Scalar/MergedLoadStoreMotion.cpp
  test/Transforms/InstMerge/st_sink_barrier_call.ll
  test/Transforms/InstMerge/st_sink_no_barrier_call.ll
  test/Transforms/InstMerge/st_sink_no_barrier_load.ll
  test/Transforms/InstMerge/st_sink_no_barrier_store.ll
  test/Transforms/InstMerge/st_sink_two_stores.ll
  test/Transforms/InstMerge/st_sink_with_barrier.ll
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