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

[Alexander Yermolovich via cfe-commits]

ayermolo wrote:

> It's been a few hours. Time to revert and analyze offline?

I think I have a fix. Just takes forever to setup and build on my laptop to test it.
Basically I think mac defaults to LLDB tuning, and test that fails explicitly passes the flag in.

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