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

[Owen Pan via cfe-commits]

owenca wrote:

> Looking forward to testing this out!

I already tested it with your reproducer in https://github.com/llvm/llvm-project/pull/142251#issuecomment-2928718530.

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