[PATCH] SDAG: Update ChainNodesMatched during UpdateChains if a node is replaced

[Ulrich Weigand via llvm-commits]

Justin Bogner <justin at justinbogner.com> wrote on 28.01.2017 01:38:23:

> Fix for llvm.org/PR31710. I'm not sure I love the test case (it's just a
> crash test) but I couldn't come up with anything more specific.

Yes, this is really hard to trigger, I had a hard time coming up with
any better test case as well ...

> Does this look good to commit?

LGTM.

Thanks,
Ulrich
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