RFR: 8262424: Change multiple get_java_xxx() functions in thread.cpp into one function [v2]

[Harold Seigel]

On Tue, 2 Mar 2021 15:41:38 GMT, Lois Foltan <lfoltan at openjdk.org> wrote:

>> Harold Seigel has updated the pull request incrementally with one additional commit since the last revision:
>> 
>>   make global buffers static
>
> Looks good.
> Lois

Thanks Coleen, Thomas, and Lois for the reviews and comments!

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PR: https://git.openjdk.java.net/jdk/pull/2750