[beta] Track closure signatures & kinds in freshened types #44148
+113
−59
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This allows caching closure signatures and kinds in the normal selection
and evaluation caches, and fixes the exponential worst-case in
@remram44's example, which is a part of #43787.
This improvement is complenentary to #43999 - they fix different cases.
This is the pre-generators variation of #43938, cloned for beta.