Thoroughly initialize IS_UNUSED for proper cleanup

Zend/zend-parser.y

@@ -497,8 +497,8 @@ function_call:
 
 
 exit_expr:
-		/* empty */		{ $$.op_type = IS_UNUSED; }	
-	|	'(' ')'			{ $$.op_type = IS_UNUSED; }	
+		/* empty */		{ memset(&$$, 0, sizeof(znode)); $$.op_type = IS_UNUSED; }	
+	|	'(' ')'			{ memset(&$$, 0, sizeof(znode)); $$.op_type = IS_UNUSED; }	
 	|	'(' expr ')'	{ $$ = $2; }
 ;
 

Zend/zend_compile.c

@@ -1183,6 +1183,8 @@ void do_early_binding(CLS_D)
 	zval_dtor(&opline->op1.u.constant);
 	zval_dtor(&opline->op2.u.constant);
 	opline->opcode = ZEND_NOP;
+	memset(&opline->op1, 0, sizeof(znode));
+	memset(&opline->op2, 0, sizeof(znode));
 	SET_UNUSED(opline->op1);
 	SET_UNUSED(opline->op2);
 }

Zend/zend_opcode.c

@@ -190,12 +190,9 @@ void init_op(zend_op *op CLS_DC)
 	op->filename = zend_get_compiled_filename(CLS_C);
 	op->result.op_type = IS_UNUSED;
 	op->extended_value = 0;
-	op->op1.u.EA.var = 0;
-	op->op1.u.EA.type = 0;
-	op->op2.u.EA.var = 0;
-	op->op2.u.EA.type = 0;
-	op->result.u.EA.var = 0;
-	op->result.u.EA.type = 0;
+	memset(&op->op1, 0, sizeof(znode));
+	memset(&op->op2, 0, sizeof(znode));
+	memset(&op->result, 0, sizeof(znode));
 }
 
 zend_op *get_next_op(zend_op_array *op_array CLS_DC)