[OpenMP][5.1] `taskwait nowait` should allow multiple `depend` clauses

[jdoerfert]

We assert as we expect a single depend clause to check if nowait is legal. Minor oversight.

https://godbolt.org/z/34fEzK7fe

void t(int a, int b) {
#pragma omp taskwait nowait depend(inout: a) depend(out: b)
}

See also: https://github.com/SOLLVE/sollve_vv/blob/master/tests/5.1/taskwait/test_task_nowait.c

[llvmbot]

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