[PATCH] DAGCombiner: Continue combining if FoldConstantArithmetic() fails.

[Matthias Braun]

I can't commit the first part without the second because it leads to the DAGCombiner folding many opaque constants back to normal constants breaking lit tests and generally defeating the intention of ContantHoisting pass.

- Matthias


REPOSITORY
  rL LLVM

http://reviews.llvm.org/D6946

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