[clang] Propagate the DWARF version from the main compiler invocation to PCHC… (PR #66032)

[Felipe de Azevedo Piovezan via cfe-commits]

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

I've confirmed that this fixes the `lang/objc/modules-objc-property/TestModulesObjCProperty.py` failure we see in the matrix bot for DWARF 5!

https://github.com/llvm/llvm-project/pull/66032