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Address two correctness issues in LoadStoreVectorizer

Authored by asbirlea on Jul 1 2016, 2:44 PM.

Description

Address two correctness issues in LoadStoreVectorizer

Summary:
GetBoundryInstruction returns the last instruction as the instruction which follows or end(). Otherwise the last instruction in the boundry set is not being tested by isVectorizable().
Partially solve reordering of instructions. More extensive solution to follow.

Reviewers: tstellarAMD, llvm-commits, jlebar

Subscribers: escha, arsenm, mzolotukhin

Differential Revision: http://reviews.llvm.org/D21934

llvm-svn: 274389