Fortran: Fixes to OpenMP 'interop' directive parsing support

Fortran: Fixes to OpenMP 'interop' directive parsing support

Handle lists as argument to 'fr' and 'attr'; fix parsing corner cases.
Additionally, 'fr' values are now internally stored as integer, permitting
the diagnoses (warning) for values not defined in the OpenMP additional
definitions document.

	PR fortran/116661

gcc/fortran/ChangeLog:

	* gfortran.h (gfc_omp_namelist): Rename 'init' members for clarity.
	* match.cc (gfc_free_omp_namelist): Handle renaming.
	* dump-parse-tree.cc (show_omp_namelist): Update for new format
	and features.
	* openmp.cc (gfc_match_omp_prefer_type): Parse list to 'fr' and 'attr';
	store 'fr' values as integer.
	(gfc_match_omp_init): Rename variable names.

gcc/ChangeLog:

	* omp-api.h (omp_get_fr_id_from_name, omp_get_name_from_fr_id): New
	prototypes.
	* omp-general.cc (omp_get_fr_id_from_name, omp_get_name_from_fr_id):
	New.

include/ChangeLog:

	* gomp-constants.h (GOMP_INTEROP_IFR_LAST,
	GOMP_INTEROP_IFR_SEPARATOR, GOMP_INTEROP_IFR_NONE): New.

gcc/testsuite/ChangeLog:

	* gfortran.dg/gomp/interop-1.f90: Extend, update dg-*.
	* gfortran.dg/gomp/interop-2.f90: Update dg-error.
	* gfortran.dg/gomp/interop-3.f90: Add dg-warning.