Revert VM changes after related bugfix

Author: Girgias

Zend/zend_vm_def.h

@@ -1059,11 +1059,6 @@ ZEND_VM_C_LABEL(assign_op_object):
 				zval *orig_zptr = zptr;
 				zend_reference *ref;
 
-				/* This case can ***ONLY*** happen if get_property_ptr_ptr emits a diagnostic
-				 * (e.g. undefined property warning) and the property is unset in the error handler */
-				if (UNEXPECTED(Z_TYPE_P(zptr) == IS_UNDEF)) {
-					ZVAL_NULL(zptr);
-				}
 				do {
 					if (UNEXPECTED(Z_ISREF_P(zptr))) {
 						ref = Z_REF_P(zptr);
@@ -1333,11 +1328,6 @@ ZEND_VM_C_LABEL(pre_incdec_object):
 					ZVAL_NULL(EX_VAR(opline->result.var));
 				}
 			} else {
-				/* This case can ***ONLY*** happen if get_property_ptr_ptr emits a diagnostic
-				 * (e.g. undefined property warning) and the propery is unset in the error handler */
-				if (UNEXPECTED(Z_TYPE_P(zptr) == IS_UNDEF)) {
-					ZVAL_NULL(zptr);
-				}
 				if (OP2_TYPE == IS_CONST) {
 					prop_info = (zend_property_info *) CACHED_PTR_EX(cache_slot + 2);
 				} else {
@@ -1409,11 +1399,6 @@ ZEND_VM_C_LABEL(post_incdec_object):
 			if (UNEXPECTED(Z_ISERROR_P(zptr))) {
 				ZVAL_NULL(EX_VAR(opline->result.var));
 			} else {
-				/* This case can ***ONLY*** happen if get_property_ptr_ptr emits a diagnostic
-				 * (e.g. undefined property warning) and the property is unset in the error handler */
-				if (UNEXPECTED(Z_TYPE_P(zptr) == IS_UNDEF)) {
-					ZVAL_NULL(zptr);
-				}
 				if (OP2_TYPE == IS_CONST) {
 					prop_info = (zend_property_info*)CACHED_PTR_EX(cache_slot + 2);
 				} else {