[region-isolation] Propagate global actor-ness of functions/closures. #72710
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I fixed a bunch of small issues around here that resulted in a bunch of radars
being fixed. Specifically:
I made it so that we treat function_refs that are from an actor isolated
function as actor isolated instead of sendable.
I made it so that autoclosures which return global actor isolated functions
are treated as producing a global actor isolated function.
I made it so that we properly handle SILGen code patterns produced by
Sendable GlobalActor isolated things.
rdar://125452372
rdar://121954871
rdar://121955895
rdar://122692698