swift

7f211769 - Skip standard substitutions for _Concurrency types when back-deploying.

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.