Chad Rosier 676d257cf2 [LIR] Allow merging of memsets in negatively strided loops.
Last part of PR25166.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@260732 91177308-0d34-0410-b5e6-96231b3b80d8
2016-02-12 21:03:23 +00:00
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