John McCall a7d7970e29 Turn finishAsyncLet into a builtin. ...

This is necessary because we need to model its stack-allocation
behavior, although I'm not yet doing that in this patch because
StackNesting first needs to be taught to not try to move the
deallocation.

I'm not convinced that `async let` *should* be doing a stack allocation,
but it undoubtedly *is* doing a stack allocation, and until we have an
alternative to that, we will need to model it properly.

2025-11-03 16:33:40 -08:00

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