[PATCH] [DAGCombiner] Fix & simplify constant folding of sext/zext.

[Paweł Bylica]

REPOSITORY
  rL LLVM

http://reviews.llvm.org/D10607

Files:
  llvm/trunk/lib/CodeGen/SelectionDAG/DAGCombiner.cpp
  llvm/trunk/test/CodeGen/X86/fold-vector-sext-crash2.ll

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