Merge branch 'PHP-8.4' into PHP-8.5

* PHP-8.4:
  Fix phpGH-20073: Assertion failure in WeakMap offset operations on reference

Author: ndossche

Zend/tests/weakrefs/gh20073.phpt

@@ -0,0 +1,15 @@
+--TEST--
+GH-20073 (Assertion failure in WeakMap offset operations on reference)
+--FILE--
+<?php
+$obj = new stdClass;
+$map = new WeakMap;
+$integer = 1;
+$map[$obj] = 0;
+$map[$obj] =& $integer;
+$integer++;
+var_dump($map[$obj], $map->offsetGet($obj));
+?>
+--EXPECT--
+int(2)
+int(2)

Zend/zend_weakrefs.c

@@ -731,7 +731,7 @@ ZEND_METHOD(WeakMap, offsetGet)
 		RETURN_THROWS();
 	}
 
-	ZVAL_COPY(return_value, zv);
+	RETURN_COPY_DEREF(zv);
 }
 
 ZEND_METHOD(WeakMap, offsetSet)