RFR: 8273186: Remove leftover comment about sparse remembered set in G1 HeapRegionRemSet

[Thomas Schatzl]

On Tue, 31 Aug 2021 16:21:33 GMT, Albert Mingkun Yang <ayang at openjdk.org> wrote:

>> Hi all,
>> 
>>   please review this trivial one-line obsolete comment about sparse remembered sets which do not exist any more.
>> 
>> Testing: local compilation
>> 
>> Thanks,
>>   Thomas
>
> Trivial.

Thanks @albertnetymk

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PR: https://git.openjdk.java.net/jdk/pull/5319