Fix handling of shared coarray indexing.

Fix handling of shared coarray indexing.

gcc/fortran/ChangeLog:

	* dependency.c: Add options.h header.
	(gfc_full_array_ref_p): Coarrays only are full if the have DIMEN_STAR.
	* trans-array.c (cas_add_strides): Remove.
	(cas_add_this_image_offset): Reorganize.
	(cas_impl_this_image_ref): Fix return for reference.
	(gfc_conv_ss_descriptor): Fix handling of offset.
	(gfc_conv_array_ref): Likewise.
	(gfc_trans_preloop_setup): Use effective dimension.
	(gfc_conv_section_startstride): Shared coarrays should be handled
	like deferred arrays.
	(gfc_get_dataptr_offset): Adjust call to cas_add_this_image_offset.
	(gfc_conv_expr_descriptor): Adjust dimensions.
	(gfc_walk_array_ref): Likewise.
	* trans-types.c (gfc_sym_type): Handle shared coarrays like
	allocatable arrays.
	(gfc_get_derived_type): Likewise.

gcc/testsuite/ChangeLog:

	* gfortran.dg/caf-shared/lower_cobound_1.f90: New test.
	* gfortran.dg/caf-shared/whole_array_1.f90: New test.