Don't track representations in context extensions.

src/objects-debug.cc

Index: src/objects-debug.cc
diff --git a/src/objects-debug.cc b/src/objects-debug.cc
index ecbf9d64200275cb8d0edc3964ed51ce2ef6cdc0..891f0d2302daee66039130097592cd9981b56564 100644
--- a/src/objects-debug.cc
+++ b/src/objects-debug.cc
@@ -306,6 +306,17 @@ void JSObject::JSObjectVerify() {
     CHECK_EQ(map()->unused_property_fields(),
              (map()->inobject_properties() + properties()->length() -
               map()->NextFreePropertyIndex()));
+    DescriptorArray* descriptors = map()->instance_descriptors();
+    for (int i = 0; i < map()->NumberOfOwnDescriptors(); i++) {
+      if (descriptors->GetDetails(i).type() == FIELD) {
+        Representation r = descriptors->GetDetails(i).representation();
+        int field = descriptors->GetFieldIndex(i);
+        Object* value = RawFastPropertyAt(field);
+        if (r.IsSmi()) ASSERT(value->IsSmi());
+        if (r.IsDouble()) ASSERT(value->IsHeapNumber());
+        if (r.IsHeapObject()) ASSERT(value->IsHeapObject());
+      }
+    }
   }
   CHECK_EQ((map()->has_fast_smi_or_object_elements() ||
              (elements() == GetHeap()->empty_fixed_array())),