[clang] [CLANG][DWARF] Do not emit -ggnu-pubnames for split dwarf version 5. (PR #82840)

[Nico Weber via cfe-commits]

nico wrote:

Looks this breaks tests on macOS: http://45.33.8.238/macm1/79435/step_7.txt

Please take a look and revert for now if it takes a while to fix.

https://github.com/llvm/llvm-project/pull/82840