re PR middle-end/51663 (Desirable/undesirable elimination of unused variables & functions at -O0, -O0 -flto and -O0 -fwhole-program)

	PR lto/51663
	* varpool.c (varpool_finalize_decl): Handle toplevel_reorder here.
	(decide_is_variable_needed): Do not handle toplevel reorder here.
	* cgraph.h (varpool_can_remove_if_no_refs): Likewise.
	* ipa.c (cgraph_remove_unreachable_nodes): Remove unreachable vars
	even at -O0.

From-SVN: r185777