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

[Ahmed Bougacha]

LGTM.
I'm okay with no test if it's tricky to expose, but maybe we can: what happens now on that AArch64 testcase?  Specifically, is there a difference between just this patch, and this patch + the assert fix in http://reviews.llvm.org/D6940?

-Ahmed


http://reviews.llvm.org/D6946

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