Double unboxing tests fixed.

test/cctest/test-unboxed-doubles.cc

Index: test/cctest/test-unboxed-doubles.cc
diff --git a/test/cctest/test-unboxed-doubles.cc b/test/cctest/test-unboxed-doubles.cc
index 2abf3c2926c434a5ff9c2a41ebc55c9dd026bf37..33597717e1446bdfad94c9eb4f65173fd0775d83 100644
--- a/test/cctest/test-unboxed-doubles.cc
+++ b/test/cctest/test-unboxed-doubles.cc
@@ -509,7 +509,8 @@ static Handle<LayoutDescriptor> TestLayoutDescriptorAppendIfFastOrUseFull(
     DCHECK(map->layout_descriptor()->IsConsistentWithMap(*map));
   }
 
-  Handle<LayoutDescriptor> layout_descriptor = map->GetLayoutDescriptor();
+  Handle<LayoutDescriptor> layout_descriptor(map->GetLayoutDescriptor(),
+                                             isolate);
   DCHECK(layout_descriptor->IsConsistentWithMap(*map));
   return layout_descriptor;
 }