[stable/20240723] [clang][ExtractAPI] combine typedef records if the underlying type's name is underscored #9978
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Cherry-pick of llvm#125964
fixes rdar://137214218
When 'typedef struct' decls are encountered, the records are combined if the underlying type is either anonymous or has the same name as the typedef. Extend this behavior to also combine records when the underlying type has an underscored name that is equivalent to the typedef name when the leading underscores are removed.