RFR: 8272736: [JVMCI] Add API for reading and writing JVMCI thread locals [v2]

[Tom Rodriguez]

On Fri, 20 Aug 2021 05:23:49 GMT, Tom Rodriguez <never at openjdk.org> wrote:

>> 8272736: [JVMCI] Add API for reading and writing JVMCI thread locals
>
> Tom Rodriguez has refreshed the contents of this pull request, and previous commits have been removed. The incremental views will show differences compared to the previous content of the PR.

testing was clean.

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PR: https://git.openjdk.java.net/jdk/pull/5192