hg: shenandoah/jdk: Remove ConstantOopWriteValue::write_on workaround in favor of upstream fix

[ashipile at redhat.com]

Changeset: d82146d195fc
Author:    rraghavan
Date:      2017-11-27 03:11 -0800
URL:       http://hg.openjdk.java.net/shenandoah/jdk/rev/d82146d195fc

Remove ConstantOopWriteValue::write_on workaround in favor of upstream fix

! src/hotspot/share/code/debugInfo.cpp
! src/hotspot/share/code/debugInfo.hpp