[PATCH] Generalize getExtendAddRecStart to work with both sign and zero extensions.

[Andrew Trick]

Thanks for generalizing this. It would seem simpler to define an ExtendOpTraits base class parameterized on ExtendOp instead of triplicating the typedef. Otherwise LGTM.

I can't remember if there are other places we've tried to generalize SCEV extension ops. I don't see anything off hand.


http://reviews.llvm.org/D7645

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