Add reproducer for possible issue with object return type inheritance

Author: kocsismate

ext/reflection/php_reflection.stub.php

@@ -459,7 +459,7 @@ public function __toString(): string {}
     public function getName() {}
 
     /** @return mixed */
-    public function getValue() {}
+    public function getValue(): mixed {}
 
     /** @return bool */
     public function isPublic() {}

ext/reflection/php_reflection_arginfo.h

@@ -1,5 +1,5 @@
 /* This is a generated file, edit the .stub.php file instead.
- * Stub hash: 47ac64b027cdeb0e9996147277f79fa9d6b876bd */
+ * Stub hash: cef133f3196139e48f8ce1ada0994e538503856d */
 
 ZEND_BEGIN_ARG_INFO_EX(arginfo_class_Reflection_getModifierNames, 0, 0, 1)
 	ZEND_ARG_TYPE_INFO(0, modifiers, IS_LONG, 0)
@@ -342,7 +342,8 @@ ZEND_END_ARG_INFO()
 
 #define arginfo_class_ReflectionClassConstant_getName arginfo_class_ReflectionFunctionAbstract_inNamespace
 
-#define arginfo_class_ReflectionClassConstant_getValue arginfo_class_ReflectionFunctionAbstract_inNamespace
+ZEND_BEGIN_ARG_WITH_RETURN_TYPE_INFO_EX(arginfo_class_ReflectionClassConstant_getValue, 0, 0, IS_MIXED, 0)
+ZEND_END_ARG_INFO()
 
 #define arginfo_class_ReflectionClassConstant_isPublic arginfo_class_ReflectionFunctionAbstract_inNamespace