Refactoring only: Make the handling of PropertyType more explicit.

src/objects-inl.h

Index: src/objects-inl.h
diff --git a/src/objects-inl.h b/src/objects-inl.h
index 55a3b2ff40d247e73d1c7fdf1d1c8d7c9751d708..3b5f58ab2ecf2d61a07ea2b5fdcd0b64402a435a 100644
--- a/src/objects-inl.h
+++ b/src/objects-inl.h
@@ -1865,9 +1865,7 @@ bool DescriptorArray::IsProperty(int descriptor_number) {
 
 
 bool DescriptorArray::IsTransition(int descriptor_number) {
-  PropertyType t = GetType(descriptor_number);
-  return t == MAP_TRANSITION || t == CONSTANT_TRANSITION ||
-      t == ELEMENTS_TRANSITION;
+  return IsTransitionType(GetType(descriptor_number));
 }