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

[Matthias Braun]

Hi resistor,

DAG.FoldConstantArithmetic() can fail even though both operands are
Constants if OpaqueConstants are involved. Continue trying other combine
possibilities in this case.

http://reviews.llvm.org/D6946

Files:
  lib/CodeGen/SelectionDAG/DAGCombiner.cpp

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