Switch to aggresive promotion in mark-sweep collections.

Review URL: http://codereview.chromium.org/1759005

git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@4525 ce2b1a6d-e550-0410-aec6-3dcde31c8c00

src/mark-compact.cc

@@ -1211,8 +1211,8 @@ static void SweepNewSpace(NewSpace* space) {
       size = object->Size();
       survivors_size += size;
 
-      if (Heap::ShouldBePromoted(current, size) &&
-          TryPromoteObject(object, size)) {
+      // Aggressively promote young survivors to the old space.
+      if (TryPromoteObject(object, size)) {
         continue;
       }