Support OpenMP's use_device_addr in Fortran

Support OpenMP's use_device_addr in Fortran

        gcc/fortran/
	* dump-parse-tree.c (show_omp_clauses): Handle OMP_LIST_USE_DEVICE_ADDR.
	* gfortran.h (enum): Add OMP_LIST_USE_DEVICE_ADDR.
	* openmp.c (omp_mask1): Likewise.
	(gfc_match_omp_clauses): Match 'use_device_addr'.
	(OMP_TARGET_DATA_CLAUSES): Add OMP_LIST_USE_DEVICE_ADDR.
	(resolve_omp_clauses): Add it; add is_device_ptr checks.

        gcc/testsuite/
	* gfortran.dg/gomp/is_device_ptr-1.f90: New.

git-svn-id: svn+ssh://gcc.gnu.org/svn/gcc/trunk@276449 138bc75d-0d04-0410-961f-82ee72b054a4