Remove struct tui_data_info

Remove struct tui_data_info

Like the previous two patches, this removes struct tui_data_info in
favor of inlining its contents into tui_data_window.  This was the
last member of the tui_win_info detail union, so that is removed.

gdb/ChangeLog
2019-06-25  Tom Tromey  <tom@tromey.com>

	* tui/tui-windata.c (tui_display_all_data)
	(tui_display_data_from_line, tui_display_data_from)
	(tui_check_data_values, tui_data_window::do_scroll_vertical):
	Update.
	* tui/tui-regs.c (tui_last_regs_line_no)
	(tui_line_from_reg_element_no, tui_first_reg_element_no_inline)
	(tui_show_registers, tui_show_register_group)
	(tui_display_registers_from, tui_display_reg_element_at_line)
	(tui_display_registers_from_line, tui_check_register_values)
	(tui_reg_next, tui_reg_prev): Update.
	* tui/tui-layout.c (tui_set_layout, show_data): Update.
	* tui/tui-data.h (struct tui_data_info): Remove.  Move contents to
	tui_data_window.
	(struct tui_win_info) <detail>: Remove.  Add new fields from
	tui_data_info.
	(TUI_DATA_WIN): Add cast.
	* tui/tui-data.c (tui_data_window::clear_detail, tui_data_window)
	(~tui_data_window): Simplify.