[clang] [OpenMP] Allow OMP6.0 features. (PR #122108)

[Zahira Ammarguellat via cfe-commits]

zahiraam wrote:

> Thanks for revising the PR. I have added some comments.
> 
> To unblock #119891, wouldn't it be sufficient that `-fopenmp-version=60` becomes a valid value? Do we need to modify all these tests to test only this flag?

Yes it's sufficient and that's what's done in #119891.
The edit in the LIT tests now are only addition of `-fopen-version=60`.

https://github.com/llvm/llvm-project/pull/122108