RFR: 8259231: Epsilon: improve performance under contention during virtual space expansion [v3]

[Lehua Ding]

On Wed, 6 Jan 2021 09:09:59 GMT, Aleksey Shipilev <shade at openjdk.org> wrote:

>> Lehua Ding has updated the pull request incrementally with one additional commit since the last revision:
>> 
>>   Epsilon: clean trailing whitespace
>
> Okay, this is good. Please also run `make run-test TEST=gc/epsilon` explicitly; it is supposed to run in tier1 already, but better be safe than sorry.

Thank you @shipilev for reviewing and sponsoring.

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PR: https://git.openjdk.java.net/jdk/pull/1794