RFR: 8282360: Merge POSIX implementations of ThreadCritical

[Harold Seigel]

On Fri, 25 Feb 2022 13:44:06 GMT, Harold Seigel <hseigel at openjdk.org> wrote:

> Please review this small change to merge the Posix (aix, bsd, linux) implementations of ThreadCritical into a single file named src/hotspot/os/posix/threadCritical_posix.cpp.  The change was tested by running Mach5 tiers 1-2 on Linux, Mac OS, and Windows, and Mach5 tiers 3-5 on Linux x64.
> 
> Thanks, Harold

Thanks Thomas, Coleen, and David for the reviews.

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PR: https://git.openjdk.java.net/jdk/pull/7622