No unreachable code in backend

ir/be/bemain.c

@@ -413,6 +413,10 @@ static void initialize_birg(be_irg_t *birg, ir_graph *irg, be_main_env_t *env)
 	/* set the current graph (this is important for several firm functions) */
 	current_ir_graph = irg;
 
+	/* For code generation all unreachable code and Bad nodes should be gone */
+	remove_unreachable_blocks(irg);
+	remove_bads(irg);
+
 	/* we do this before critical edge split. As this produces less returns,
 	   because sometimes (= 164.gzip) multiple returns are slower */
 	normalize_n_returns(irg);