[PATCH] [X86][SSE] Improve matching of SSE blend instructions with splatted vector inputs

[Simon Pilgrim]

Hi chandlerc, andreadb,

If the input to a shuffle is safely splatted (i.e. no undef) then the SSE blend instructions can use any lane from that input to match against.

REPOSITORY
  rL LLVM

http://reviews.llvm.org/D6652

Files:
  lib/Target/X86/X86ISelLowering.cpp
  test/CodeGen/X86/combine-or.ll
  test/CodeGen/X86/vector-blend.ll

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