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

[Krzysztof Parzyszek via llvm-commits]

kparzysz wrote:

I can add a flang test for it (clang won't likely handle it, since "workshare" is Fortran-only).

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