Nate Chandler b0fc8daa83 [Runtime] Add entry point to canonicalize metadata. ...

The new function swift_getCanonicalSpecializedMetadata takes a metadata
request, a prespecialized non-canonical metadata, and a cache as its
arguments.  The idea of the function is either to bless the provided
prespecialized metadata as canonical if there is not currently a
canonical metadata record for the type it describes or else to return
the actual canonical metadata.

When called, the metadata cache checks for a preexisting entry for this
metadata.  If none is found, the passed-in prespecialized metadata is
added to the cache.  Otherwise, the metadata record found in the cache
is returned.

rdar://problem/56995359

2020-07-15 15:27:36 -07:00

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