Don't record slots of objects that may contain raw values.

src/objects.h

Index: src/objects.h
diff --git a/src/objects.h b/src/objects.h
index e2fac8ef9f128a765fb50d2024a47773a3b7ba2b..75cff5759dc8feeff72af3c80e84b7cc9811b8f0 100644
--- a/src/objects.h
+++ b/src/objects.h
@@ -1740,9 +1740,9 @@ class HeapObject: public Object {
   // Returns the heap object's size in bytes
   inline int Size();
 
-  // Returns true if this heap object may contain pointers to objects in new
-  // space.
-  inline bool MayContainNewSpacePointers();
+  // Returns true if this heap object may contain raw values, i.e., values that
+  // look like pointers to heap objects.
+  inline bool MayContainRawValues();
 
   // Given a heap object's map pointer, returns the heap size in bytes
   // Useful when the map pointer field is used for other purposes.