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

Fri Sep 3 20:02:37 UTC 2021

On Wed, 1 Sep 2021 18:03:11 GMT, Tom Rodriguez <never at openjdk.org> wrote:

> This evacuates all JVMCI related methods and fields into a separately declared struct.

I pushed a commit that address all the comments and cleans up the header a bit.  Testing of this commit was clean.  Hopefully I haven't introduced any new things which should be address.

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