Roman Lebedev 2d07414ee5 [SimplifyCFG] Teach simplifyUnreachable() to preserve DomTree ...

Pretty boring, removeUnwindEdge() already known how to update DomTree,
so if we are to call it, we must first flush our own pending updates;
otherwise, we just stop predecessors from branching to us,
and for certain predecessors, stop their predecessors from
branching to them also.

2020-12-18 00:37:22 +03:00

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