[clang] [clang][driver] Fix an issue where clang does not correctly resolve the system header if invoked via symlink (on MacOS) (PR #68091)

[Jan Svoboda via cfe-commits]

jansvoboda11 wrote:

> @jansvoboda11, since the Apple clang already fixed this bug, could you suggest how to proceed? Could you backport the Apple patch to upstream?

I'm not familiar with this, but @yln might.

https://github.com/llvm/llvm-project/pull/68091