[PATCH] [X86][SSE] Improve support for 128-bit vector sign extension

[Simon Pilgrim]

REPOSITORY
  rL LLVM

http://reviews.llvm.org/D9848

Files:
  llvm/trunk/lib/CodeGen/SelectionDAG/DAGCombiner.cpp
  llvm/trunk/lib/CodeGen/SelectionDAG/SelectionDAG.cpp
  llvm/trunk/lib/Target/X86/X86ISelLowering.cpp
  llvm/trunk/test/CodeGen/X86/pr15267.ll
  llvm/trunk/test/CodeGen/X86/vec_cast2.ll
  llvm/trunk/test/CodeGen/X86/vector-sext.ll
  llvm/trunk/test/CodeGen/X86/vselect-avx.ll

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