RFR: 8263551: Provide shared lock-free FIFO queue implementation [v2]

[Man Cao]

On Sun, 14 Mar 2021 02:50:37 GMT, Kim Barrett <kbarrett at openjdk.org> wrote:

>> Man Cao has updated the pull request incrementally with one additional commit since the last revision:
>> 
>>   Address comment and add a gtest.
>
> Tests?  There should be some gtests to go with this.

Could anyone continue reviewing the updated pull request?

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