re PR target/41473 (dsymutil "Assertion failed ...")

	PR debug/41473
	* dwarf2out.c (add_var_loc_to_decl): Don't drop initial empty
	locations.
	(new_loc_list): Drop gensym arg.  Move generation of ll_symbol...
	(gen_llsym): ... here.  New function.
	(add_loc_descr_to_loc_list): Removed.
	(loc_descriptor): Infer mode from CONST_DOUBLEs and CONST_VECTORs.
	(single_element_loc_list): Removed.
	(dw_loc_list): Don't create entries without a location.  Don't
	special-case the first node of the list, only single nodes.
	(single_element_loc_list_p): Simplify.
	(loc_list_from_tree): Don't use DECL_RTL if loc_list is nonempty.
	(add_location_or_const_value_attribute): Test var loc for NULL.
	(convert_cfa_to_fb_loc_list): Adjust calls to new new_loc_list,
	call gen_llsym if needed.

From-SVN: r155221