Commits on Aug 28, 2021

1. Don't crash when calling gc() on a committed TyperState …

   An already-committed TyperState might be committed again when errors are
   flushed (cf scala#12827, scala#13150) and `commit()` calls `gc()`. This operation
   could crash before this commit because we attempted to instantiate type
   variables no longer owned by the TyperState. We fix this by clearing
   `ownedVars` when committing a TyperState (because after committing it no
   longer owns any type variable).
   
   Fixes scala#13407.

   

   smarter committed Aug 28, 2021
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