Doug Gregor 7f2117690c Skip standard substitutions for _Concurrency types when back-deploying. ...

When back-deploying concurrency support, do not use the standard
substitutions for _Concurrency-defined types (such as `Task`) in type
metadata because older Swift runtimes will not be able to demangle
them. Instead, use the full mangled names so the runtime can still
demangle them appropriately.

Addresses rdar://82931890.

2021-09-09 13:23:19 -07:00

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