[4.2] More errors instead of crashes for conditional conformances that are invalid or involve hard-to-resolve recursion #17385
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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).
…n error cases. When we're trying to diagnose something, it's a bad look if we crash instead. This changes the bad-associated-type recovery path to not require that the conditional requirements have been computed, and instead detects that as a possible error. Fixes https://bugs.swift.org/browse/SR-8033.
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4.2 merge of #17356