[PATCH] [IndVarSimplify] Widen signed loop compare instructions to enable additional optimizations.

[Chad Rosier]

Thanks, Sanjay.  I'll investigate now.

> Hi Chad -
> I think this patch caused or exposed some other bug here:
> http://llvm.org/bugs/show_bug.cgi?id=21030
>
> http://reviews.llvm.org/D5333
>
>
>