RFR: 8263551: Provide shared lock-free FIFO queue implementation

[Kim Barrett]

On Sat, 13 Mar 2021 10:41:44 GMT, Man Cao <manc at openjdk.org> wrote:

> Hi all,
> 
> Could anyone review this change that is mainly code motion? It creates a generalized lock-free queue implementation based on G1DirtyCardQueueSet::Queue, which will be used by JDK-8236485 in the future.
> 
> The shared LockFreeQueue is similar to the existing LockFreeStack. The notable difference is that the LockFreeQueue has an additional template parameter for whether to use GlobalCounter::CriticalSection to avoid ABA problem.
> 
> -Man

Tests?  There should be some gtests to go with this.

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PR: https://git.openjdk.java.net/jdk/pull/2986