[cxx-interop] Support types nested in extensions #82712
Merged
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The generated header did not compile due to a bug that prevented us from referencing the correct namespaces derived from the nominal type's name (an extension does not have a name). Moreover, we did not generate forward declarations for the members of the extensions for classes and enums (but we did for structs). This change also removes a workaround that emitted String::Index as _String_Index.
rdar://153221450