Roman Lebedev d22a47e9ff [SimplifyCFG] Teach mergeEmptyReturnBlocks() to preserve DomTree ...

A first real transformation that didn't already knew how to do that,
but it's pretty tame - either change successor of all the predecessors
of a block and carefully delay deletion of the block until afterwards
the DomTree updates are appled, or add a successor to the block.

There wasn't a great test coverage for this, so i added extra, to be sure.

2020-12-17 01:03:50 +03:00

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