Pavel Yaskevich 7ed3d754b5 [Serialization] Allow unbound generic types to cross-reference typealias decls ...

Ideally `UnboundGenericType` should never be serialized but it is
currently allowed to make generic `typealias` declarations without
specifying generic parameters, so it should be allowed to cross
reference typealias decls in such types as well because `NameAliasType`
can't be used until generic parameters are resolved.

This is only a temporary fix and more comprehensive solution is still
pending here, most likely such declarations should not produce
`UnboundGenericType` but instead should copy generic parameters from
underlying type and produce proper `NameAliasType`.

Resolves: rdar://problem/37384120

2018-05-22 18:17:21 -07:00

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