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

[Nikita Popov via cfe-commits]

nikic wrote:

> so [12e3ed8](https://github.com/llvm/llvm-project/commit/12e3ed8de8c6063b15916b3faf67c8c9cd17df1f) should resolve both lldb buildbot breakage and compile time regression in clang.

Thank you, I can confirm that this fixes the compile-time regression (or at least most of it).

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