[IDE][InterfaceGen] Always print the top-level decl in header file generated interfaces. #31964
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While the decls being printed for header file generated interfaces were mapped from the top-level clang decls in that file, the Swift decls they correspond to may not be top-level. E.g. top-level functions in the header file can be mapped to property accessors on the Swift side, which were being printed simply as "get" at the top level.
This updates header interface generation to map each decl to its top-level decl before printing.
Resolves rdar://problem/63409659