RFR: 8256298: Shenandoah: Enable concurrent stack processing [v4]

[Zhengyu Gu]

On Mon, 25 Jan 2021 16:05:44 GMT, Aleksey Shipilev <shade at openjdk.org> wrote:

>> Zhengyu Gu has updated the pull request incrementally with one additional commit since the last revision:
>> 
>>   More of Roman's comments
>
> src/hotspot/share/gc/shenandoah/shenandoahStackWatermark.cpp line 59:
> 
>> 57: void ShenandoahStackWatermark::change_epoch_id() {
>> 58:   shenandoah_assert_safepoint();
>> 59:   _epoch_id ++;
> 
> Excess space before `++`.

Done

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PR: https://git.openjdk.java.net/jdk/pull/2185