omp-expand.c (expand_omp_for_static_nochunk): Don't emit GOMP_loop_start at the start of second worksharing loop in a scan.

	* omp-expand.c (expand_omp_for_static_nochunk): Don't emit
	GOMP_loop_start at the start of second worksharing loop in a scan.
	For nowait, don't emit GOMP_loop_end_nowait at the end of first
	worksharing loop in a scan even if there are conditional lastprivates,
	and do emit GOMP_loop_end_nowait at the end of second worksharing loop.

	* testsuite/libgomp.c/scan-9.c: New test.
	* testsuite/libgomp.c/scan-10.c: New test.

From-SVN: r273095