[clang] [clang-tools-extra] [Tooling] Resolve relative "directory" against the compilation database (PR #235400)

[Aleksandr Platonov via cfe-commits]

https://github.com/ArcsinX commented:

It looks like CI failures relate to this PR changes, maybe we need to understand the reason.

https://github.com/llvm/llvm-project/pull/235400