[GSB] Allow redundant inheritance for all Objective-C-defined protocols. #15338
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Swift complains about redundant inheritance of a protocol, and
canonicalizes away such redundancies in its metadata. Clang does not
warn about such redundancies, nor does the Objective-C "conforms to
protocol" check take inheritance into account. Extend the existing
"redundant inheritance" hack (designed for JSExport) to cover all
protocols defined in Objective-C, so we match Clang's output of
Objective-C metadata.
Fixes SR-7130 / rdar://problem/38394637.