Nate Chandler cda11b90a1 [Runtime] Add prespecialized-caching getGenericMetadata variant. ...

Add a new entry point for getting generic metadata which adds the
canonical metadata records attached to the nominal type descriptor to
the metadata cache.

Change the implementation of the primary entry-point
swift_getGenericMetadata to stop looking through canonical
prespecialized records.

Change the implementation of swift_getCanonicalSpecializedMetadata to
use the caching token attached to the nominal type descriptor to add
canonical prespecialized metadata records to the metadata cache only
once rather than using the cache variables to limit the number of times
the attempt was made.

2020-11-01 13:35:03 -08:00

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