[llvm] [DWARF] Refactor .debug_names bucket count computation (PR #88087)

[Felipe de Azevedo Piovezan via llvm-commits]

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

LGTM, especially because we're getting rid of  sorting an input array, instead sorting it where it was created.

https://github.com/llvm/llvm-project/pull/88087