Doug Gregor 5b027ca456 Back-deploy creation of global-actor-qualified function type metadata. ...

When back-deploying, create global-actor-qualified function types via a
separate entrypoint
(`swift_getFunctionTypeMetadataGlobalActorBackDeploy`) in the
compatibility library, which checks whether it is running with a
new-enough runtime to use `swift_getFunctionTypeMetadataGlobalActor`.
Failing that, it calls into a separate copy of the implementation that
exists only in the back-deployed concurrency library.

Fixes rdar://79153988.

2021-09-13 10:35:47 -07:00

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