Add unittests to keep InstanceType lists in sync

test/unittests/heap/heap-unittest.cc

 // Copyright 2014 the V8 project authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include <cmath>
+#include <iostream>
 #include <limits>
 
 #include "src/objects.h"
 #include "src/objects-inl.h"
 
 #include "src/handles.h"
 #include "src/handles-inl.h"
 
 #include "src/heap/heap.h"
 #include "testing/gtest/include/gtest/gtest.h"
@@ skipping 23 matching lines @@
   CheckEqualRounded(1.193, Heap::HeapGrowingFactor(200, 1));
   CheckEqualRounded(1.121, Heap::HeapGrowingFactor(300, 1));
   CheckEqualRounded(Heap::HeapGrowingFactor(300, 1),
                     Heap::HeapGrowingFactor(600, 2));
   CheckEqualRounded(Heap::kMinHeapGrowingFactor,
                     Heap::HeapGrowingFactor(400, 1));
 }
 
 }  // namespace internal
 }  // namespace v8