IRGen: Fulfill pack metadata from tuple metadata #68130
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When the SelfMetadata in a witness thunk is the tuple type (repeat each Self),
we can fulfill the pack shape and type metadata for Pack{repeat each Self}
from tuple metadata.
The length is trivially projected; the type metadata pack is slightly more
involved, because tuple metadata stores a list of element/offset pairs, so
we must stack allocate a pack and fill it in.
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For witness thunks of tuple conformances.