[clang] [libTooling] Fix `getFileRangeForEdit` for inner nested template types (PR #87673)

[Yitzhak Mandelbaum via cfe-commits]

https://github.com/ymand approved this pull request.

Nice work - really subtle! I'd been wondering how clang handles this issue (of relexing returning the wrong token because it lacked context).

https://github.com/llvm/llvm-project/pull/87673