[PATCH] InstCombine: extract instead of shuffle when performing vector/array type punning

[JF Bastien]

Hi jvoung, chandlerc,

SROA generates code that isn't quite as easy to optimize and contains unusual-sized shuffles, but that code is generally correct. As discussed in D7487 the right place to clean things up is InstCombine, which will pick up the type-punning pattern and transform it into a more obvious bitcast+extractelement, while leaving the other patterns SROA encounters as-is.

http://reviews.llvm.org/D7734

Files:
  lib/Transforms/InstCombine/InstCombineVectorOps.cpp
  test/Transforms/InstCombine/type_pun.ll

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