Fix the order of callbacks related to the taskloop construct. Add the iteration_count (according to the spec). Add a testcase.

Fix the order of callbacks related to the taskloop construct. Add the iteration_count to work callbacks (according to the spec). Use kmpc_omp_task() instead of kmp_omp_task() to include OMPT callbacks. Add a testcase.

Fix the order of callbacks related to the taskloop construct. Add the iteration_count to work callbacks (according to the spec)ec). Use kmpc_omp_task() instead of kmp_omp_task() to include OMPT callbacks. Add a testcase.