RFR: 8261804: Remove field _processing_is_mt, calculate it instead

[Leo Korinth]

On Wed, 24 Feb 2021 17:58:29 GMT, Kim Barrett <kbarrett at openjdk.org> wrote:

>> In the reference processor, remove _processing_is_mt. Instead calculate its value in its accessor, processing_is_mt().
>> 
>> This change will remove some state, make RefProcMTDegreeAdjuster a bit simpler and make it much easier to derive when processing is indeed multi threaded.
>
> src/hotspot/share/gc/shared/referenceProcessor.hpp line 417:
> 
>> 415: 
>> 416:   // Whether we are in a phase when _processing_ is MT.
>> 417:   bool processing_is_mt() const { return ParallelRefProcEnabled && _num_queues > 1; }
> 
> I don't think this needs to be inline, and I think moving it to the .cpp file would avoid needing to include gc_globals.hpp here.

I agree and will fix it, thanks for spotting it!

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PR: https://git.openjdk.java.net/jdk/pull/2704