[5.0] [GSB] Avoid unresolved dependent member types in generic signatures. #14626
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The GenericSignatureBuilder is allowing unresolved dependent member
types to creep into generic signatures, which eventually blows up in
name mangling. Prefer to pick dependent member types that are
fully-resolved when choosing anchors.
This is a spot fix; a better approach would eliminate the notion of
unresolved dependent member types entirely from
PotentialArchetype. That's tracked by rdar://problem/35839277.
Fixes rdar://problem/36549499.