trace compare_nil_ic state in --trace-ic output

src/ic.cc

 // 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 2910 matching lines @@
 
 MaybeObject* CompareNilIC::CompareNil(Handle<Object> object) {
   Code::ExtraICState extra_ic_state = target()->extended_extra_ic_state();
 
   CompareNilICStub stub(extra_ic_state);
 
   // Extract the current supported types from the patched IC and calculate what
   // types must be supported as a result of the miss.
   bool already_monomorphic = stub.IsMonomorphic();
 
+  CompareNilICStub::Types old_types = stub.GetTypes();
   stub.Record(object);
+  old_types.TraceTransition(stub.GetTypes());
 
   EqualityKind kind = stub.GetKind();
   NilValue nil = stub.GetNilValue();
 
   // Find or create the specialized stub to support the new set of types.
   Handle<Code> code;
   if (stub.IsMonomorphic()) {
     Handle<Map> monomorphic_map(already_monomorphic
                                 ? target()->FindFirstMap()
                                 : HeapObject::cast(*object)->map());
@@ skipping 60 matching lines @@
 #undef ADDR
 };
 
 
 Address IC::AddressFromUtilityId(IC::UtilityId id) {
   return IC_utilities[id];
 }
 
 
 } }  // namespace v8::internal