hg: jdk9/hs-rt/hotspot: 8134806: Clean up write_ref_field_work

[kim.barrett at oracle.com]

Changeset: d487a586ed9c
Author:    kbarrett
Date:      2015-09-02 11:41 -0400
URL:       http://hg.openjdk.java.net/jdk9/hs-rt/hotspot/rev/d487a586ed9c

8134806: Clean up write_ref_field_work
Summary: Remove unnecessary pure virtual decl and default argument values.
Reviewed-by: jwilhelm, tbenson, jmasa

! src/share/vm/gc/g1/g1SATBCardTableModRefBS.cpp
! src/share/vm/gc/g1/g1SATBCardTableModRefBS.hpp
! src/share/vm/gc/shared/barrierSet.hpp
! src/share/vm/gc/shared/cardTableModRefBS.hpp
! src/share/vm/gc/shared/modRefBarrierSet.hpp