Slava Pestov e342a38b87 Sema: Convert TypeChecker::computeCaptures() into two requests ...

We now compute captures of functions and default arguments
lazily, instead of as a side effect of primary file checking.

Captures of closures are computed as part of the enclosing
context, not lazily, because the type checking of a single
closure body is not lazy.

This fixes a specific issue with the `-experimental-skip-*` flags,
where functions declared after a top-level `guard` statement are
considered to have local captures, but nothing was forcing these
captures to be computed.

Fixes rdar://problem/125981663.

2024-04-20 22:16:25 -04:00

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