OpenMP: declare variant's append_args + dispatch interop fixes

OpenMP: declare variant's append_args + dispatch interop fixes

For 'omp dispatch interop(obj)', call omp_get_interop_int to
obtain the device number. Add new error if no device clause is
present if multiple interop-clause list items exist.

Update some vars and continue after appending interop args
instead of restarting to ensure that adjust_args updates
are actually performed.

gcc/ChangeLog:

	* builtin-types.def (BT_FN_PTRMODE_PTR_INT_PTR): Add.
	* gimplify.cc (gimplify_call_expr): Add error for multiple
	list items to the OpenMP interop clause if no device clause;
	continue instead of restarting after append_args handling.
	(gimplify_omp_dispatch): Extract device number from the
	single interop-clause list item.
	* omp-builtins.def (BUILT_IN_OMP_GET_INTEROP_INT): Add.

gcc/fortran/ChangeLog:

	* types.def (BT_FN_PTRMODE_PTR_INT_PTR): Add.

gcc/testsuite/ChangeLog:

	* c-c++-common/gomp/append-args-1.c: Update dg-*.
	* c-c++-common/gomp/append-args-3.c: Extend testcase.
	* c-c++-common/gomp/dispatch-11.c: Update dg-*.
	* c-c++-common/gomp/dispatch-12.c: Update dg-*.
	* g++.dg/gomp/append-args-1.C: Update dg-*.