Fix unserialization ref source management, again

Handle one case the previous patch did not account for: If
unserialization of data fails, we should still register a ref
source.

Also add an extra test for a reference between two typed properties,
as this used to be handled incorrectly earlier.

Author: nikic

ext/standard/tests/serialize/typed_property_ref_assignment_failure.phpt

@@ -16,6 +16,14 @@ try {
     echo $e->getMessage(), "\n";
 }
 
+$s = <<<'STR'
+O:4:"Test":1:{s:4:"prop";a:1:{i:0;R:2;
+STR;
+var_dump(unserialize($s));
+
 ?>
---EXPECT--
+--EXPECTF--
 Cannot assign stdClass to property Test::$prop of type int
+
+Notice: unserialize(): Error at offset 38 of 38 bytes in %s on line %d
+bool(false)

ext/standard/tests/serialize/typed_property_refs.phpt

@@ -13,6 +13,11 @@ class B {
     public int $b;
 }
 
+class E {
+    public $a;
+    public int $b;
+}
+
 class C {
     public int $a;
     public string $b;
@@ -25,6 +30,7 @@ class D {
 
 var_dump(unserialize('O:1:"A":2:{s:1:"a";i:1;s:1:"b";R:2;}'));
 var_dump(unserialize('O:1:"B":2:{s:1:"a";i:1;s:1:"b";R:2;}'));
+var_dump(unserialize('O:1:"E":2:{s:1:"a";i:1;s:1:"b";R:2;}'));
 
 try {
     var_dump(unserialize('O:1:"A":2:{s:1:"a";N;s:1:"b";R:2;}'));
@@ -66,6 +72,12 @@ object(B)#1 (2) {
   ["b"]=>
   &int(1)
 }
+object(E)#1 (2) {
+  ["a"]=>
+  &int(1)
+  ["b"]=>
+  &int(1)
+}
 Cannot assign null to property A::$a of type int
 Cannot assign null to property B::$b of type int
 Cannot assign int to property C::$b of type string

ext/standard/var_unserializer.re

@@ -578,6 +578,11 @@ string_key:
 		}
 
 		if (!php_var_unserialize_internal(data, p, max, var_hash, 0)) {
+			if (info && Z_ISREF_P(data)) {
+				/* Add type source even if we failed to unserialize.
+				 * The data is still stored in the property. */
+				ZEND_REF_ADD_TYPE_SOURCE(Z_REF_P(data), info);
+			}
 			zval_ptr_dtor(&key);
 			goto failure;
 		}