[PATCH] Hoist load based on alias analysis

[Demikhovsky, Elena]

(Sorry for multiple mails, I did not use the phabricator before, please review..)

I use alias analysis to define whether the given instruction is a barrier for load hoisting.
When I find 2 identical loads, I check all preceding instructions in the both basic blocks. 
I'll also look at sinking stores in the next patch.

http://reviews.llvm.org/D5991


Files:
  lib/Transforms/Scalar/MergedLoadStoreMotion.cpp 
Files:
  lib/Transforms/Scalar/MergedLoadStoreMotion.cpp
  test/Transforms/InstMerge/ld_hoist1.ll
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Intel Israel (74) Limited

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