2011-10-19  Mikael Morin  <mikael@gcc.gnu.org>

	* trans.h (struct gfc_ss, struct gfc_ss_info): Move field
	gfc_ss::data::info into gfc_ss_info::data and remove empty union
	gfc_ss::data.
	* trans-array.c (gfc_free_ss, gfc_trans_create_temp_array,
	gfc_trans_constant_array_constructor, gfc_trans_array_constructor,
	gfc_set_vector_loop_bounds, gfc_add_loop_ss_code,
	gfc_conv_ss_descriptor, gfc_trans_array_bound_check,
	gfc_conv_array_index_offset, gfc_conv_scalarized_array_ref,
	add_array_offset, gfc_trans_preloop_setup,
	gfc_trans_scalarized_boundary, gfc_conv_section_startstride,
	gfc_conv_ss_startstride, gfc_could_be_alias,
	gfc_conv_loop_setup, gfc_conv_expr_descriptor,
	gfc_alloc_allocatable_for_assignment, gfc_walk_array_ref):
	Update reference chains and factor them where possible.
	* trans-expr.c (gfc_conv_variable, gfc_conv_subref_array_arg,
	gfc_conv_procedure_call, gfc_trans_subarray_assign): Updata reference
	chains.
	* trans-intrinsic.c (gfc_conv_intrinsic_transfer): Ditto.
	* trans-io.c (transfer_array_component): Ditto.
	* trans-stmt.c (gfc_conv_elemental_dependencies,
	gfc_trans_pointer_assign_need_temp): Ditto.