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rev 6672 : imported patch bengt-fixes2

@@ -734,10 +734,13 @@
                        VerifyOption vo, bool all) PRODUCT_RETURN;
   // Clear the next marking bitmap (will be called concurrently).
   void clearNextBitmap();
+  // Return whether the next mark bitmap has no marks set.
+  bool nextMarkBitmapIsClear();
   // These two do the work that needs to be done before and after the
   // initial root checkpoint. Since this checkpoint can be done at two
   // different points (i.e. an explicit pause or piggy-backed on a
   // young collection), then it's nice to be able to easily share the
   // pre/post code. It might be the case that we can put everything in