[clang] [llvm] [OpenMP 60] Update parsing and semantic support for `nowait` clause to accept optional argument (PR #159628)

[Alexey Bataev via cfe-commits]

https://github.com/alexey-bataev commented:

IIRC, you'll need to handle capturing just like for if clause

https://github.com/llvm/llvm-project/pull/159628