[PATCH] [LoopVectorize] Induction variables: support arbitrary constant step

[Nadav Rotem]

Hao, this patch LGTM.  This is a major change to the vectorizer so please run the llvm test suite and try to identify miscompiles or regressions. 


> On Jan 28, 2015, at 7:22 AM, hfinkel at anl.gov wrote:
> 
> LGTM.
> 
> 
> http://reviews.llvm.org/D7193
> 
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