Fortran/openmp: Partial OpenMP 5.2 doacross and omp_cur_iteration support

Fortran/openmp: Partial OpenMP 5.2 doacross and omp_cur_iteration support

Add the Fortran support to the ME/C/C++ commit
r13-2388-ga651e6d59188da8992f8bfae2df1cb4e6316f9e6

gcc/fortran/ChangeLog:

	* dump-parse-tree.cc (show_omp_namelist, show_omp_clauses): Handle
	omp_cur_iteration and distinguish doacross/depend.
	* gfortran.h (enum gfc_omp_depend_doacross_op): Renamed from
	gfc_omp_depend_op.
	(enum gfc_omp_depend_doacross_op): Add OMP_DOACROSS_SINK_FIRST,
	Rename OMP_DEPEND_SINK to OMP_DOACROSS_SINK.
	(gfc_omp_namelist) Handle renaming, rename depend_op to
	depend_doacross_op.
	(struct gfc_omp_clauses): Add doacross_source.
	* openmp.cc (gfc_match_omp_depend_sink): Renamed to ...
	(gfc_match_omp_doacross_sink): ... this; handle omp_all_memory.
	(enum omp_mask2): Add OMP_CLAUSE_DOACROSS.
	(gfc_match_omp_clauses): Handle 'doacross' and syntax changes to
	depend.
	(gfc_match_omp_depobj): Simplify as sink/source are now impossible.
	(gfc_match_omp_ordered_depend): Request OMP_CLAUSE_DOACROSS.
	(resolve_omp_clauses): Update sink/source checks.
	(gfc_resolve_omp_directive): Resolve EXEC_OMP_ORDERED clauses.
	* parse.cc (decode_omp_directive): Handle 'ordered doacross'.
	* trans-openmp.cc (gfc_trans_omp_clauses): Handle doacross.
	(gfc_trans_omp_do): Fix OMP_FOR_ORIG_DECLS handling if 'ordered'
	clause is present.
	(gfc_trans_omp_depobj): Update for member name change.

libgomp/ChangeLog:

	* libgomp.texi (OpenMP 5.2): Update doacross/omp_cur_iteration status.

gcc/testsuite/ChangeLog:

	* gfortran.dg/gomp/all-memory-1.f90: Update dg-error.
	* gfortran.dg/gomp/depend-iterator-2.f90: Likewise.
	* gfortran.dg/gomp/depobj-2.f90: Likewise.
	* gfortran.dg/gomp/doacross-5.f90: New test.
	* gfortran.dg/gomp/doacross-6.f90: New test.