[llvm] [LLVM][OpenMP] "nowait" clause is valid for "workshare" (PR #88426)

[via llvm-commits]

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

LGTM: nowait has been part of OpenMP since 4.5 (or earlier, I didn't check 4.0).
It'd be nice if you added a clang/test/OpenMP minimal test. I checked and I couldn't find a single parse test for the workshare directive.

https://github.com/llvm/llvm-project/pull/88426