[PATCH] Add straight-line strength reduction to LLVM

[hfinkel at anl.gov]

In http://reviews.llvm.org/D7310#117774, @jingyue wrote:

> Hal, do you think this patch is good to go, given we don't push it to the standard pipeline yet? I left a TODO on the ILP issue you raised. I like your point a lot, but I feel I should do it in a separate diff.


Yes, that's fine with me. Let's iterate in-tree. Please proceed.


http://reviews.llvm.org/D7310

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