Doug Gregor bd5f5d80e4 [AST] Add ExtensionDecl::getExtendedNominal(). ...

Introduce ExtensionDecl::getExtendedNominal() to provide the nominal
type declaration that the extension declaration extends. Move most
of the existing callers of the callers to getExtendedType() over to
getExtendedNominal(), because they don’t need the full type information.

ExtensionDecl::getExtendedNominal() is itself not very interesting yet,
because it depends on getExtendedType().

2018-08-03 11:26:48 -07:00

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