[clang] [clang-format] Correctly annotate token-pasted function decl names (PR #142337)

[Pierre Jolivet via cfe-commits]

prj- wrote:

Unfortunately, we have many other use-cases for triggering regressions in our code (hence we are having this discussion in the first place 😅).

https://github.com/llvm/llvm-project/pull/142337