Separating transitions from descriptors.

test/cctest/test-heap.cc

Index: test/cctest/test-heap.cc
diff --git a/test/cctest/test-heap.cc b/test/cctest/test-heap.cc
index e7ff3d0b26e28aac94b15266921e5d151ff1d860..211a20c1ea109f2a8e03105558e66e6c00f59588 100644
--- a/test/cctest/test-heap.cc
+++ b/test/cctest/test-heap.cc
@@ -1743,14 +1743,7 @@ TEST(OptimizedAllocationAlwaysInNewSpace) {
 
 
 static int CountMapTransitions(Map* map) {
-  int result = 0;
-  DescriptorArray* descs = map->instance_descriptors();
-  for (int i = 0; i < descs->number_of_descriptors(); i++) {
-    if (descs->IsTransitionOnly(i)) {
-      result++;
-    }
-  }
-  return result;
+  return map->transitions()->number_of_transitions();
 }