hg: jdk/jdk: 8205043: Make parallel reference processing default for G1

[thomas.schatzl at oracle.com]

Changeset: 724ed31f9d05
Author:    tschatzl
Date:      2018-06-19 09:34 +0200
URL:       http://hg.openjdk.java.net/jdk/jdk/rev/724ed31f9d05

8205043: Make parallel reference processing default for G1
Reviewed-by: kbarrett, sjohanss

! src/hotspot/share/gc/g1/g1Arguments.cpp
+ test/hotspot/jtreg/gc/arguments/TestParallelRefProc.java