[PATCH] [X86][SSE] Bitcast assertion in XFormVExtractWithShuffleIntoLoad

[Simon Pilgrim]

Hi chandlerc, spatel,

Minor patch to fix an issue in XFormVExtractWithShuffleIntoLoad where a load is unary shuffled, then bitcast (to a type with the same number of elements) before extracting an element.

An undef was created for the second shuffle operand using the original (post-bitcasted) vector type instead of the pre-bitcasted type like the rest of the shuffle node - this was then causing an assertion on the different types later on inside SelectionDAG::getVectorShuffle.

http://reviews.llvm.org/D5917

Files:
  lib/Target/X86/X86ISelLowering.cpp
  test/CodeGen/X86/extractelement-load.ll
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