Instead of
* adding a zval on the stack
* initializing it
* copying the value to the attribute
Just initialize the value directly in the zend_attribute_arg
Instead of allocating, using, and then releasing a zend_string for every
property name unconditionally, only do so when the minimum supported version of
PHP does not have that string in its known strings (ZEND_KNOWN_STRINGS). If the
string is already known, just use the known version directly. This is already
done for some non-generated class registrations, e.g. in
`zend_enum_register_props()`.
Currently, internal classes are registered with the following code:
INIT_CLASS_ENTRY(ce, "InternalClass", class_InternalClass_methods);
class_entry = zend_register_internal_class_ex(&ce, NULL);
class_entry->ce_flags |= ...;
This has worked well so far, except if InternalClass is readonly. It is because some inheritance checks are run by zend_register_internal_class_ex before ZEND_ACC_READONLY_CLASS is added to ce_flags.
The issue is fixed by adding a zend_register_internal_class_with_flags() zend API function that stubs can use from now on. This function makes sure to add the flags before running any checks. Since the new API is not available in lower PHP versions, gen_stub.php has to keep support for the existing API for PHP 8.3 and below.
@cname currently refers to the constant name in C. However, it is not always a (constant) name, but sometimes a function invocation, so naming it as @cvalue would be more appropriate.
