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

[Paweł Bylica]

Extend the test to check zext variant and constant values in output.


http://reviews.llvm.org/D10607

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

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