RFR: 8231672: Simplify the reference processing parallelization framework [v5]

[Leo Korinth]

On Sat, 24 Apr 2021 09:45:28 GMT, Albert Mingkun Yang <ayang at openjdk.org> wrote:

>> Leo Korinth has updated the pull request with a new target base due to a merge or a rebase. The pull request now contains seven commits:
>> 
>>  - make RefProcTask a StackObj
>>  - Merge branch 'master' into _8231672
>>  - using proxies instead of ClosureContexts
>>  - remove maybe prefix, change in one place to nullable
>>  - Merge branch 'master' into _8231672
>>  - Changes after first review
>>  - 8231672: Simplify the reference processing parallelization framework
>
> src/hotspot/share/gc/shared/referenceProcessor.cpp line 224:
> 
>> 222: 
>> 223:   {
>> 224:     RefProcTotalPhaseTimesTracker tt(RefPhase1, &phase_times, this);
> 
> `RefProcTotalPhaseTimesTracker` doesn't really use `this`, right?

Nice catch! Pre-existing, but I will clean it up.

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PR: https://git.openjdk.java.net/jdk/pull/2782