[clang] [APINotes] Support nested tags (PR #99655)

[Egor Zhdan via cfe-commits]

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@@ -456,6 +458,7 @@ template <> struct MappingTraits<Tag> {
     IO.mapOptional("EnumKind", T.EnumConvenienceKind);
     IO.mapOptional("SwiftCopyable", T.SwiftCopyable);
     IO.mapOptional("Methods", T.Methods);
+    IO.mapOptional("Tags", T.Tags);
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egorzhdan wrote:

It's just the tags that have associated attributes. It's similar to how Obj-C methods and properties are stored in `struct Class` above.

https://github.com/llvm/llvm-project/pull/99655