Introduce extra IC state to record additional feedback from IC-s.

src/type-info.h

 // Copyright 2010 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 201 matching lines @@
     kString = 0x30,        // 0110000
     kNonPrimitive = 0x40,  // 1000000
     kUninitialized = 0x7f  // 1111111
   };
   explicit inline TypeInfo(Type t) : type_(t) { }
 
   Type type_;
 };
 
 
+enum StringStubFeedback {
+  DEFAULT_STRING_STUB = 0,
+  STRING_INDEX_OUT_OF_BOUNDS = 1
+};
+
+
 // Forward declarations.
 class Assignment;
 class BinaryOperation;
 class Call;
 class CompareOperation;
 class CompilationInfo;
 class Property;
 class CaseClause;
 
 class TypeFeedbackOracle BASE_EMBEDDED {
@@ skipping 42 matching lines @@
 
   Handle<Context> global_context_;
   Handle<JSObject> map_;
 
   DISALLOW_COPY_AND_ASSIGN(TypeFeedbackOracle);
 };
 
 } }  // namespace v8::internal
 
 #endif  // V8_TYPE_INFO_H_