[PATCH] Handling store to invariant address in LAA

[Ashutosh Nema]

Over previous change, it contains following:

Fixed: PR23157
StoreToLoopInvariantAddress was not handled correctly and missing previous value.
Added new test case to handle similar scenario.


REPOSITORY
  rL LLVM

http://reviews.llvm.org/D8653

Files:
  include/llvm/Analysis/LoopAccessAnalysis.h
  lib/Analysis/LoopAccessAnalysis.cpp
  lib/Transforms/Vectorize/LoopVectorize.cpp
  test/Analysis/LoopAccessAnalysis/store-to-invariant-check1.ll
  test/Analysis/LoopAccessAnalysis/store-to-invariant-check2.ll
  test/Analysis/LoopAccessAnalysis/store-to-invariant-check3.ll

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