[clang] [clang-format] Handle templates in qualified typenames (PR #143194)

[Owen Pan via cfe-commits]

https://github.com/owenca requested changes to this pull request.

Please run `ninja clang-format-check-format` before `git push`.

Also, run `ninja polly-check-format`, which gives the assertion failure below:
```
Assertion failed: (Tok->is(TT_TemplateOpener)), function getFunctionName, file TokenAnnotator.cpp, line 3699.
```

https://github.com/llvm/llvm-project/pull/143194