[PATCH] [X86] replace vextractf128 intrinsics with generic shuffles (LLVM)

[Sanjay Patel]

In http://reviews.llvm.org/D8276#139537, @craig.topper wrote:

> Are you going to do the AVX2 version of these too?


Those appear to be pure copy / paste / delete, so I went ahead and checked them in here:

http://reviews.llvm.org/rL232109
http://reviews.llvm.org/rL232120


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