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

[JF Bastien]

- s/BC->hasNUsesOrMore(1)/!BC->use_empty()/


http://reviews.llvm.org/D7734

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

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