Doug Gregor b5f45f8f72 [IRGen] Mangle Swift @objc(renamed) protocols as Objective-C in metadata. ...

When emitting metadata for a Swift-defined @objc protocol that has
provided a specific Objective-C name (e.g., via @objc(renamed)),
mangle such protocols using their Objective-C names so they can be
found at runtime.

Only do this for metadata, because doing it anywhere else would cause
an ABI break. Fixes rdar://problem/47877748.

2019-02-25 17:31:08 -08:00

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