zend_vm_def: Use FREE_OP1() in ZEND_FREE handler (#18131)

This is for consistency with other opcode handlers. It does not
have an effect on the generated VM.

Zend/zend_vm_def.h

@@ -3207,7 +3207,7 @@ ZEND_VM_HANDLER(70, ZEND_FREE, TMPVAR, ANY)
 	USE_OPLINE
 
 	SAVE_OPLINE();
-	zval_ptr_dtor_nogc(EX_VAR(opline->op1.var));
+	FREE_OP1();
 	ZEND_VM_NEXT_OPCODE_CHECK_EXCEPTION();
 }