RFR (XS): 8232779: G1 current collection parallel time does not include optional evacuation

[Thomas Schatzl]

Hi all,

   can I have reviews for this change that fixes the calculation of 
G1GCPhaseTimes::cur_collection_par_time_ms(): we forgot to consider the 
optional evacuation time.

This causes too long Other time, having minor effects on pause time 
prediction.

CR:
https://bugs.openjdk.java.net/browse/JDK-8232779
Webrev:
http://cr.openjdk.java.net/~tschatzl/8232779/webrev/
Testing:
local compilation

Thanks,
   Thomas