RFR: 8299275: Add some ClassLoaderData verification code [v2]

[Coleen Phillimore]

On Thu, 5 Jan 2023 17:09:56 GMT, Ioi Lam <iklam at openjdk.org> wrote:

>> Yes, I did add the deallocate_list verification too.  I can change the title of the bug.
>
> This code seem unsafe since you are checking for `is_klass()` but cast to `InstanceKlass*`. Since `verify()` is in `Klass` anyway, it's better to say
> 
> 
>  if (m->is_klass()) {
>    ((Klass*)m)->verify();

fixed.

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PR: https://git.openjdk.org/jdk/pull/11856