[PATCH] [X86] Fix pattern match for 32-to-64-bit zext in the presence of AssertSext

[Sanjay Patel]

Michael,
Thanks for working on this. If your patch doesn't cause any existing regression tests to fail, then you got further than I did. :)
It seems like a good solution to me, but let's have someone more familiar with the x86 backend take a look...or any backend? You said this bug also affects AArch64 and MSP430?

http://reviews.llvm.org/D6128