[Clang importer] Fix mirroring of protocol decls for 'async' imports. #37169
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The de-duplication checks to preventing redundant mirroring of protocol
declarations failed to consider that a given method could be
implemented as both 'async' and non-'async' declarations, and
therefore would fail to mirror the 'async' form. Account for this
distinction.
Fixes rdar://76799297.