[Patch] PHI->GEP->PHI combine, take 2

[Louis Gerbarg]

Okay, here is a substantially improved version of the PHI->GEP->PHI InstCombine patch from a week ago. It now checks for GEPs into structs to avoid illegal combines, which I believe was the last cause of the sanitzer and stage2 failures. I would appreciate it if someone who is on a platform that supports sanitizers could it a whirl. It works for me with all the reductions I have as well as a stage2 build on Darwin.

Louis

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