swift

334024db - [Runtime] Use the old remangler to compute the @objc protocol name.

[Runtime] Use the old remangler to compute the @objc protocol name. The “old” mangling that is used for runtime names of @objc protocols uses a simpler substitution scheme, so you can’t simply take a mangled name from the new mangling and fix up the ends. Fixes rdar://problem/45685649.