[clang] [clang-format][NFC] Clean up alignTrailingComments() (PR #67218)

[Nico Weber via cfe-commits]

nico wrote:

This seems to break tests: http://45.33.8.238/linux/119090/step_8.txt

Please take a look and revert for now if it takes a while to fix.

https://github.com/llvm/llvm-project/pull/67218