RFR(xs): 8186465: Each j.l.Reference elapsed time log is incorrect

[sangheon.kim]

Hi all,

Could I have some reviews for this tiny fix?
The problem is each j.l.References has wrong time log as related 
function is using wrong variable.
Actually it should be using '_ref_proc_time_ms' but accidentally using 
'_par_phase_time_ms'. Setter is using correct one but getter is 
referring wrong one.

CR: https://bugs.openjdk.java.net/browse/JDK-8186465
webrev: http://cr.openjdk.java.net/~sangheki/8186465/webrev.0/
Testing: manually checked log values

Thanks,
Sangheon