[PATCH] [X86] Improve a dag-combine that handles a vector extract -> zext sequence.

[Michael Kuperstein]

Thanks, Quentin!

Sure, will add that.
It'll have to be slightly more contrived because it needs to have an explicit zext, as opposed to an implicit extension coming from a GEP, but that's no big deal.

http://reviews.llvm.org/D6501