hg: shenandoah/jdk: Move shenandoah_eliminate_wb_pre to ShenandoahBarrierSetC2

[roman at kennke.org]

Changeset: c592128e45b6
Author:    rkennke
Date:      2018-09-11 23:15 +0200
URL:       http://hg.openjdk.java.net/shenandoah/jdk/rev/c592128e45b6

Move shenandoah_eliminate_wb_pre to ShenandoahBarrierSetC2

! src/hotspot/share/gc/shenandoah/c2/shenandoahBarrierSetC2.cpp
! src/hotspot/share/gc/shenandoah/c2/shenandoahBarrierSetC2.hpp
! src/hotspot/share/opto/compile.cpp
! src/hotspot/share/opto/compile.hpp
! src/hotspot/share/opto/macro.cpp