re PR c/91149 (GCC 9 and later incorrectly rejects OpenMP task reduction-modifier on target parallel combined construct)

	PR c/91149
	* c-omp.c (c_omp_split_clauses): Fix a pasto in
	OMP_CLAUSE_REDUCTION_TASK handling.

	* c-c++-common/gomp/reduction-task-3.c: New test.

From-SVN: r273465