[PATCH] SLPVectorizer: Cache results from memory alias checking.

[Chandler Carruth]

Thanks for reverting and sending this out.

My only comment beyond Arnold's (as he knows this code much better than I do) is that it would be good to document this invariant of BoUpSLP somewhere other than a member comment. Not sure what the best place is.


http://reviews.llvm.org/D6951

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