[clang] [clang-tools-extra] [llvm] [clang] Introduce diagnostics suppression mappings (PR #112517)

[kadir çetinkaya via cfe-commits]

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kadircet wrote:

this is already tested in https://github.com/llvm/llvm-project/pull/112517/files#diff-a8d03c054381627f238bdb8f7914daa4abebdae705d313dda026ce36eca0fe2fR327-R332

https://github.com/llvm/llvm-project/pull/112517