[PATCH] [X86, AVX] instcombine common cases of vperm2* intrinsics into shuffles

[Sanjay Patel]

Patch updated based on feedback from Andrea:

1. Made the simplify function static - avoids header changes w/o adding any extra lines to the switch
2. Fixed comment regarding the zero mask case - will add that in a future patch
3. Moved some local variables closer to their usage
4. Added TODO for the equivalent AVX2 (integer) intrinsic


http://reviews.llvm.org/D8486

Files:
  lib/Transforms/InstCombine/InstCombineCalls.cpp
  test/Transforms/InstCombine/x86-vperm2.ll

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