RFR: 8292006: Move thread accessor classes to threadJavaClasses.hpp

[David Holmes]

On Sat, 6 Aug 2022 00:11:08 GMT, Ioi Lam <iklam at openjdk.org> wrote:

> To improve modularity and build time, move the declaration of the following accessor from classfile/javaClasses.hpp to runtime/threadJavaClasses.hpp:
> 
> + java_lang_Thread_FieldHolder
> + java_lang_Thread_Constants
> + java_lang_ThreadGroup
> + java_lang_VirtualThread
> 
> Also move javaThreadStatus.hpp from share/classfile to share/runtime, where it belongs.

My issue with these kinds of changes in general is that they:
- undermine institutional memory
- make it harder to do backports due to the shuffling
- make it harder to track changes due to the shuffling

So the benefit to me has to be more than just a small decrease in some build times which most people are never going to notice anyway. Sorry. Just my 2c.

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PR: https://git.openjdk.org/jdk/pull/9788