Joe Groff fe7ecec60c Runtime: Provide value witness implementations for class existentials. ...

Same deal as for opaque existentials--pre-instantiate a static witness table for one-witness-table types (the zero-witness-tables case is nicely handled by Builtin.ObjCPointer's value witness), and generate a vwtable using dynamic witness implementations for each different-sized container on demand as necessary.

Swift SVN r9850

2013-10-31 18:38:54 +00:00

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