[clang] [clang] Remove -g[no-]-* bool flags from g_Group (PR #162750)

[Alexander Kornienko via cfe-commits]

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

Not enabling debug info for -gno-... options seems to be the right behavior. One might argue about the positive options, but I think, that's also correct. At least, it's better than the current situation: now the options being changed here override `-gmlt` with `-g`, which also doesn't seem intentional.

Looks good with one comment re: "Implies -g."

https://github.com/llvm/llvm-project/pull/162750