[PATCH] [DagCombiner] Allow shuffles to merge through bitcasts

[Simon Pilgrim]

Thanks Quentin. The assert for re-scalable scalar types has been changed into part of the type legality test - I've also used that opportunity to remove the code duplication between scaling the inner or outer shuffles. I've also updated the tests to use undef where possible.


REPOSITORY
  rL LLVM

http://reviews.llvm.org/D7939

Files:
  lib/CodeGen/SelectionDAG/DAGCombiner.cpp
  test/CodeGen/X86/2013-02-12-ShuffleToZext.ll
  test/CodeGen/X86/vector-shuffle-128-v16.ll
  test/CodeGen/X86/vector-shuffle-128-v2.ll
  test/CodeGen/X86/vector-shuffle-128-v4.ll
  test/CodeGen/X86/vector-shuffle-256-v4.ll
  test/CodeGen/X86/vector-shuffle-mmx.ll

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