Commits
Doug Gregor committed 171a18c96c0
[Runtime] Extract an embedded NSError when dynamic casting to an Error existential. SILGen already attempts to extract an embedded NSError when type-erasing to an Error existential; make the runtime do the same thing dynamically. Huge thanks to Joe Groff who noticed that I missed this path. (cherry picked from commit e83fb64917bdc948eded079bc67c634c70a2ecd5)