Michael Gottesman 4a71042d31 [ownership] Add a DeadEndBlocksAnalysis that vends/saves DeadEndBlocks in between passes. ...

Importantly this also lets us use the analysis framework to validate that we do
properly invalidate DeadEndBlocks, preventing bugs.

I did not thread this all over the compiler. Instead I just used it for now in
SemanticARCOpts just to add some coverage without threading it into too many
places.

2021-01-18 15:23:14 -08:00

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