hg: shenandoah/jdk: Revert "Handle missing ShenandoahWriteBarrierRB case"

[ashipile at redhat.com]

Changeset: 50f57eff7e5a
Author:    shade
Date:      2018-08-02 16:00 +0200
URL:       http://hg.openjdk.java.net/shenandoah/jdk/rev/50f57eff7e5a

Revert "Handle missing ShenandoahWriteBarrierRB case"

! src/hotspot/share/gc/shenandoah/c2/shenandoahSupport.cpp