Doug Gregor 637412c14d [Mangling] Consider overlays when determining retroactive conformances. ...

When determining whether a given normal protocol conformance is “retroactive”,
consider an overlay module to be equivalent to its underlying Clang module.
Therefore, don’t classify conformances within the overlay as “retroactive”,
simplifying some common manglings (e.g., NSObject’s Hashable conformance is
no longer considered retroactive) and better capturing the intent.

2018-11-03 21:38:17 -07:00

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