Ahmed Bougacha 4f196793f2 [X86] Don't assume that MMX extractelts are from index 0.
It's probably the case for all 3 MMX users out there, but with
hand-crafted IR, you can trigger selection failures. Fix that.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@267652 91177308-0d34-0410-b5e6-96231b3b80d8
2016-04-27 01:35:29 +00:00
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