[Serialization] Filter Objective-C methods by mangled name rather than type ID. #8838
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Module files store all of the Objective-C method entrypoints in a
central table indexed by selector, then filter the results based on
the specific class being requested. Rather than storing the class as
a TypeID---which requires a bunch of deserialization---store its
mangled name. This allows us to deserialize less, and causes circular
deserialization in rdar://problem/31615640.