RFR: Mixed evacuation [v2]

[Kelvin Nilsen]

On Fri, 9 Apr 2021 13:18:13 GMT, Zhengyu Gu <zgu at openjdk.org> wrote:

>> Kelvin Nilsen has updated the pull request incrementally with one additional commit since the last revision:
>> 
>>   Chasing bug during prepare_for_old_collection
>>   
>>   One bug fix, a few cosmetic improvements, a change in loop structure to possibly avoid a gcc
>>   optimization error.
>
> src/hotspot/share/gc/shenandoah/shenandoahPhaseTimings.hpp line 67:
> 
>> 65:   f(finish_mark,                                    "  Finish Mark")                   \
>> 66:   SHENANDOAH_PAR_PHASE_DO(finish_mark_,             "    FM: ", f)                     \
>> 67:   f(coalesce_and_fill,                              "Coalesce and Fill Old Dead")      \
> 
> Does not seem to be used anywhere.

Is used in shenandoahOldGC.cpp:entry_coalesce_and_fill().

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PR: https://git.openjdk.java.net/shenandoah/pull/29