Roman Lebedev a14c36fe27 [SimplifyCFG] switchToSelect(): don't forget to insert DomTree edge iff needed ...

DestBB might or might not already be a successor of SelectBB,
and it wasn't we need to ensure that we record the fact in DomTree.

The testcase used to crash in lazy domtree updater mode + non-per-function
domtree validity checks disabled.

2021-01-15 23:35:57 +03:00

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