hg: jdk/sandbox: 8209843: Optimize oop scan closure closures wrt to reference processing in G1

[chris.hegarty at oracle.com]

Changeset: 469ab7c92a32
Author:    tschatzl
Date:      2018-09-12 11:08 +0200
URL:       http://hg.openjdk.java.net/jdk/sandbox/rev/469ab7c92a32

8209843: Optimize oop scan closure closures wrt to reference processing in G1
Summary: Set more appropriate reference iteration mode for G1 closures.
Reviewed-by: kbarrett, pliden

! src/hotspot/share/gc/g1/g1OopClosures.hpp
! src/hotspot/share/oops/instanceRefKlass.inline.hpp