OpenMP: Handle 'all' as category in defaultmap

Both, specifying no category and specifying 'all', implies
that the implicit-behavior applies to all categories.

gcc/c/ChangeLog:

	* c-parser.cc (c_parser_omp_clause_defaultmap): Parse
	'all' as category.

gcc/cp/ChangeLog:

	* parser.cc (cp_parser_omp_clause_defaultmap): Parse
	'all' as category.

gcc/fortran/ChangeLog:

	* gfortran.h (enum gfc_omp_defaultmap_category):
	Add OMP_DEFAULTMAP_CAT_ALL.
	* openmp.cc (gfc_match_omp_clauses): Parse
	'all' as category.
	* trans-openmp.cc (gfc_trans_omp_clauses): Handle it.

gcc/ChangeLog:

	* tree-core.h (enum omp_clause_defaultmap_kind): Add
	OMP_CLAUSE_DEFAULTMAP_CATEGORY_ALL.
	* gimplify.cc (gimplify_scan_omp_clauses): Handle it.
	* tree-pretty-print.cc (dump_omp_clause): Likewise.

libgomp/ChangeLog:

	* libgomp.texi (OpenMP 5.2 status): Add depobj with
	destroy-var argument as 'N'. Mark defaultmap with
	'all' category as 'Y'.

gcc/testsuite/ChangeLog:

	* gfortran.dg/gomp/defaultmap-1.f90: Update dg-error.
	* c-c++-common/gomp/defaultmap-5.c: New test.
	* c-c++-common/gomp/defaultmap-6.c: New test.
	* gfortran.dg/gomp/defaultmap-10.f90: New test.
	* gfortran.dg/gomp/defaultmap-9.f90: New test.