[LLVMdev] SimplifyIndVar looses nsw flags

[Jonas Wagner]

> Coincidentally, we were just discussing this issue as part of the "Re:
> [LLVMdev] [llvm] r184698 - Add a flag to defer vectorization into a phase
> after the inliner and its" thread. I believe that Andy mentioned something
> about how he felt this should fix fixed.
>

Thanks! It seems that it's indeed a complex issue... I feel I don't have
the necessary knowledge of LLVM's optimizations to do something about it.
But if this continues to hurt me, or if somebody has concrete ideas of how
to fix it, I'll look at the code.

- Jonas
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