RFR(S): 8232232: G1RemSetSummary::_rs_threads_vtimes is not initialized to zero

[Kim Barrett]

> On Oct 14, 2019, at 9:56 PM, Man Cao <manc at google.com> wrote:
> 
> Hi all,
> 
> Can I have reviews for this fix for logging messages of "Concurrent
> refinement threads times (s)", and code cleanup?
> 
> Webrev: https://cr.openjdk.java.net/~manc/8232232/webrev.00/
> Bug: https://bugs.openjdk.java.net/browse/JDK-8232232
> 
> -Man

Looks good.