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

[JF Bastien]

- s/ShuffleIsExtractingFromLHS/isShuffleExtractingFromLHS/
- Clarify documentation.
- Add tests for bitcasts to types of the same size, and control flow.
- Cache previously generated bitcasts so they only get generated once, and generate them where the old shuffle used to be to ensure they dominate all potential uses.
- Use InstCombine's IRBuilder.


http://reviews.llvm.org/D7734

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

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