JDK-8230501: Class data support for hidden classes

[Mandy Chung]

On 11/10/20 1:35 PM, forax at univ-mlv.fr wrote:
>
> I think it's better to use a structured object like a record instead 
> of using a list which requires all objects to have the same type.
>

Requiring all objects of the same type may be too restrictive.

OTOH, it is not a bad idea to hold off `classDataAt` and wait until more 
demands and usages to tell if such a convenience API is needed and in 
what form.   I'm okay with hiding this method for now.

Mandy