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Variant on D70103. The caching is switched to always use a BB to cache entry map, which then contains per-value caches. A separate set contains value handles with a deletion callback. This allows us to properly invalidate overdefined values. A possible alternative would be to always cache by value first and have per-BB maps/sets in the each cache entry. In that case we could use a ValueMap and would avoid the separate value handle set. I went with the BB indexing at the top level to make it easier to integrate D69914, but possibly that's not the right choice. Differential Revision: https://reviews.llvm.org/D70376
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