Fix Clang bug that -Wformat-signedness is not reported properly. (#150962) The goal is to correctly identify diagnostics that are emitted by virtue of -Wformat-signedness. Before this change, diagnostic messages triggered by -Wformat-signedness might look like: format specifies type 'unsigned int' but the argument has type 'int' [-Wformat] signedness of format specifier 'u' is incompatible with 'c' [-Wformat] With this change: format specifies type 'unsigned int' but the argument has type 'int', which differs in signedness [-Wformat-signedness] signedness of format specifier 'u' is incompatible with 'c' [-Wformat-signedness] Fix: - handleFormatSignedness can now return NoMatchSignedness. Callers handle this. - warn_format_conversion_argument_type extends the message it used to emit by a string that mentions "signedness". - warn_format_cmp_specifier_sign_mismatch is now correctly categorized as a diagnostic controlled by -Wformat-signedness.
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