RFR: 8307483: New micros for j.u.c.LockSupport [v3]

[Claes Redestad]

On Tue, 9 May 2023 19:13:42 GMT, Eric Caspole <ecaspole at openjdk.org> wrote:

>> These micros were developed while investigating JDK-8305670 by myself and Sergey Kuksenko. The order of thread creation was important in that bug, so there are 2 JMH for creating sleepers before and after the worker threads.
>
> Eric Caspole has updated the pull request incrementally with one additional commit since the last revision:
> 
>   Add review comments changes.

LGTM with @shipilev's suggestions

-------------

Marked as reviewed by redestad (Reviewer).

PR Review: https://git.openjdk.org/jdk/pull/13815#pullrequestreview-1430623870