hg: jdk/jdk: 8201527: Bump default value of G1RefProcDrainInterval

[thomas.schatzl at oracle.com]

Changeset: 3cdebcdc8ec0
Author:    tschatzl
Date:      2018-04-18 19:00 +0200
URL:       http://hg.openjdk.java.net/jdk/jdk/rev/3cdebcdc8ec0

8201527: Bump default value of G1RefProcDrainInterval
Summary: Due to high startup cost of marking, lower the frequency of draining the mark stack generated by reference processing.
Reviewed-by: sangheki, sjohanss

! src/hotspot/share/gc/g1/g1ConcurrentMark.cpp
! src/hotspot/share/gc/g1/g1_globals.hpp