Explicitly initialize the is_load_store attribute.

[r27805]

ir/be/arm/arm_new_nodes.c

@@ -369,6 +369,7 @@ static void init_arm_attributes(ir_node *node, int flags,
 
 	arch_irn_set_flags(node, flags);
 	attr->in_req           = in_reqs;
+	attr->is_load_store    = false;
 
 	info            = be_get_info(node);
 	info->out_infos = NEW_ARR_D(reg_out_info_t, obst, n_res);

ir/be/arm/arm_nodes_attr.h

@@ -64,8 +64,8 @@ enum fpa_immediates {
 /** Generic ARM node attributes. */
 typedef struct arm_attr_t {
 	except_attr                 exc;                /**< the exception attribute. MUST be the first one. */
-	const arch_register_req_t **in_req;  /**< register requirements for arguments */
-	bool                        is_load_store : 1;
+	const arch_register_req_t **in_req;             /**< register requirements for arguments */
+	bool                        is_load_store : 1;  /**< if set, this is a load or store instruction */
 } arm_attr_t;
 
 /**