[PATCH] [X86, AVX] instcombine vperm2 intrinsics with zero inputs into shuffles

[Sanjay Patel]

Thanks, Andrea!

For the record, I did a little Clang test case dance with r233109 and r233111
in an attempt to not cause any buildbot breakage with this commit (r233110). 
I learned my lesson from the last two similar changes. :)

Is it wrong that a Clang regression test has a dependency on the IR optimizer?


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http://reviews.llvm.org/D8567

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