[clang] [clang] Implement __attribute__((format_matches)) (PR #116708)

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apple-fcloutier wrote:

This is not intended. There is a test for a function with both a printf and scan format (https://github.com/swiftlang/llvm-project/blob/8909cd902bf9985185f59b612e478fc096e91308/clang/test/Sema/format-strings.c#L490), but it doesn't cover the implementation of such a function.

https://github.com/llvm/llvm-project/pull/116708