Remove runtime storeval barrier

[Roman Kennke]

The storeval_barrier() in BarrierSet is no longer used. It's all covered
by the Access API now. Let's remove the API. I'll keep the
ShenandoahBarrierSet part for internal use.

diff --git a/src/hotspot/share/gc/shared/barrierSet.hpp
b/src/hotspot/share/gc/shared/barrierSet.hpp
--- a/src/hotspot/share/gc/shared/barrierSet.hpp
+++ b/src/hotspot/share/gc/shared/barrierSet.hpp
@@ -137,9 +137,6 @@
   virtual oop write_barrier(oop src) {
     return src;
   }
-  virtual oop storeval_barrier(oop src) {
-    return src;
-  }

   virtual void keep_alive_barrier(oop obj) {
     // Default impl does nothing.


Ok?

Roman