Second attempt at introducing a premonomorphic state in the call

src/objects-inl.h

 // Copyright 2012 the V8 project authors. All rights reserved.
 // Redistribution and use in source and binary forms, with or without
 // modification, are permitted provided that the following conditions are
 // met:
 //
 //     * Redistributions of source code must retain the above copyright
 //       notice, this list of conditions and the following disclaimer.
 //     * Redistributions in binary form must reproduce the above
 //       copyright notice, this list of conditions and the following
 //       disclaimer in the documentation and/or other materials provided
@@ skipping 6519 matching lines @@
   if (length() == 0) return this;
   return GetHeap()->CopyConstantPoolArray(this);
 }
 
 
 Handle<Object> TypeFeedbackInfo::UninitializedSentinel(Isolate* isolate) {
   return isolate->factory()->the_hole_value();
 }
 
 
+Handle<Object> TypeFeedbackInfo::PremonomorphicSentinel(Isolate* isolate) {
+  return isolate->factory()->null_value();
+}
+
+
 Handle<Object> TypeFeedbackInfo::MegamorphicSentinel(Isolate* isolate) {
   return isolate->factory()->undefined_value();
 }
 
 
 Handle<Object> TypeFeedbackInfo::MonomorphicArraySentinel(Isolate* isolate,
     ElementsKind elements_kind) {
   return Handle<Object>(Smi::FromInt(static_cast<int>(elements_kind)), isolate);
 }
 
@@ skipping 189 matching lines @@
 #undef READ_UINT32_FIELD
 #undef WRITE_UINT32_FIELD
 #undef READ_SHORT_FIELD
 #undef WRITE_SHORT_FIELD
 #undef READ_BYTE_FIELD
 #undef WRITE_BYTE_FIELD
 
 } }  // namespace v8::internal
 
 #endif  // V8_OBJECTS_INL_H_