[PATCH] D21909: [DSE]Enhance shorthening MemIntrinsic based on OverlapIntervals

[Jun Bum Lim via llvm-commits]

junbuml created this revision.
junbuml added reviewers: hfinkel, mcrosier, eeckstein.
junbuml added a subscriber: llvm-commits.
Herald added a subscriber: mcrosier.

This change use the overlap interval map built from partial overwrite tracking to perform shortening MemIntrinsics.
Add test cases which was missing opportunities before.

http://reviews.llvm.org/D21909

Files:
  lib/Transforms/Scalar/DeadStoreElimination.cpp
  test/Transforms/DeadStoreElimination/OverwriteStoreBegin.ll
  test/Transforms/DeadStoreElimination/OverwriteStoreEnd.ll

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