* trans.h (struct gfc_ss, struct gfc_ss_info): Move member struct
	gfc_ss::data::scalar into newly created union gfc_ss_info::data,
	and rename subfield expr to value.
	* trans-array.c (gfc_add_loop_ss_code, gfc_conv_array_index_offset,
	gfc_conv_expr_descriptor): Update reference chains.
	* trans-const.c (gfc_conv_constant): Ditto.
	* trans-expr.c (gfc_conv_expr): Ditto.

From-SVN: r180870