[clang] [clang] consistently quote expressions in diagnostics (PR #134769)

[Aaron Ballman via cfe-commits]

https://github.com/AaronBallman commented:

Please be sure to update https://github.com/llvm/llvm-project/blob/46d4c3b1f64dfbca2a029ff30434aaa5248fc190/clang/docs/InternalsManual.rst?plain=1#L227 as well so the new `%quoted` specifier is explicitly documented.

https://github.com/llvm/llvm-project/pull/134769