[PATCH] Sink store based on alias analysis

[Ella Bolshinsky]

================
Comment at: test/Transforms/InstMerge/st_sink_no_barrier_call.ll:45
@@ +44,2 @@
+
+attributes #0 = { readnone } 
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Gerolf wrote:
> Please remove
If I remove the attribute, the call to foo will be a barrier (as in the test above - st_sink_barrier_call).

http://reviews.llvm.org/D6420