RFR: 8137018: [JVMCI] Encapsulate new Thread fields for JVMCI [v2]

[Tom Rodriguez]

On Wed, 1 Sep 2021 19:34:28 GMT, Coleen Phillimore <coleenp at openjdk.org> wrote:

>> Tom Rodriguez has updated the pull request incrementally with one additional commit since the last revision:
>> 
>>   Review cleanups
>
> src/hotspot/share/jvmci/jvmci.hpp line 183:
> 
>> 181: };
>> 182: 
>> 183: 
> 
> There seems to be a crazy amount of whitespace here.

I'd meant to go back and pretty this up.  I was just dumping things in there as I migrated them from elsewhere.  I've grouped them with some short comments and tried to clean it up.  I also fixed some visibility issues and removed the use of friend for JavaThread.

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PR: https://git.openjdk.java.net/jdk/pull/5339