Add test for checking tilesizes gets rejected

Author: Stylie777

flang/test/Semantics/OpenMP/taskloop04.f90

@@ -0,0 +1,15 @@
+! When lowering Taskloop, it is possible for the TileSizes clause to be lowered, but this is not a supported clause.
+! We should make sure that any use of Tilesizes with Taskloop is correctly rejected by the Semantics.
+! RUN: %python %S/../test_errors.py %s %flang -fopenmp
+
+subroutine test
+    integer :: i, sum
+
+    !ERROR: TILE cannot follow TASKLOOP
+    !ERROR: SIZES clause is not allowed on the TASKLOOP directive
+    !$omp taskloop tile sizes(2)
+    do i=1,10
+        sum = sum + i
+    end do
+    !$omp end taskloop
+end subroutine