Huon Wilson 10b30fef78 [GSB] Explicit error on unsupported conditional conformance recursion. ...

This doesn't fix the fundamental problem of correctly handling such cases, but
it is better than the "error message" that occurred previously:

    Assertion failed: ((bool)typeSig == (bool)extensionSig && "unexpected generic-ness mismatch on conformance").

Fixes the crash rdar://problem/41281406 (that in
https://bugs.swift.org/browse/SR-6569 (rdar://problem/36068136)),
https://bugs.swift.org/browse/SR-8019 (rdar://problem/41216423) and
https://bugs.swift.org/browse/SR-7989 (rdar://problem/41126254).

2018-06-21 10:53:30 +10:00

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