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

[Albert Mingkun Yang]

On Tue, 31 Aug 2021 16:08:43 GMT, Thomas Schatzl <tschatzl 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.

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Marked as reviewed by ayang (Reviewer).

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