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

[Liviu Ionescu via cfe-commits]

ilg-ul wrote:

The Linux tests were fine, but the Windows tests failed in `Interpreter/const.cpp`, which does not seem to be related to my patch.



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