[clang] [llvm] Add source file name for template instantiations in -ftime-trace (PR #98320)

[Ilya Biryukov via cfe-commits]

https://github.com/ilya-biryukov commented:

A few more suggestions, and happy to approve as soon as the question about source events gets resolved.

https://github.com/llvm/llvm-project/pull/98320