Added back some utf8 optimizations

src/objects.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 7308 matching lines @@
   DECLARE_VERIFIER(Symbol)
 
   // Layout description.
   static const int kSize = Name::kSize;
 
  private:
   DISALLOW_IMPLICIT_CONSTRUCTORS(Symbol);
 };
 
 
+class ConsString;
+
 // The String abstract class captures JavaScript string values:
 //
 // Ecma-262:
 //  4.3.16 String Value
 //    A string value is a member of the type String and is a finite
 //    ordered sequence of zero or more 16-bit unsigned integer values.
 //
 // All string values have a length field.
 class String: public Name {
  public:
@@ skipping 258 matching lines @@
       if (*chars > kMaxOneByteCharCodeU) return static_cast<int>(chars - start);
       ++chars;
     }
     return static_cast<int>(chars - start);
   }
 
   static inline bool IsOneByte(const uc16* chars, int length) {
     return NonOneByteStart(chars, length) >= length;
   }
 
+  // TODO(dcarney): Replace all instances of this with VisitFlat.
   template<class Visitor, class ConsOp>
   static inline void Visit(String* string,
                            unsigned offset,
                            Visitor& visitor,
                            ConsOp& cons_op,
                            int32_t type,
                            unsigned length);
 
+  template<class Visitor>
+  static inline ConsString* VisitFlat(Visitor* visitor,
+                                      String* string,
+                                      int offset,
+                                      int length,
+                                      int32_t type);
+
+  template<class Visitor>
+  static inline ConsString* VisitFlat(Visitor* visitor,
+                                      String* string,
+                                      int offset = 0) {
+    int32_t type = string->map()->instance_type();
+    return VisitFlat(visitor, string, offset, string->length(), type);
+  }
+
  private:
   friend class Name;
 
   // Try to flatten the top level ConsString that is hiding behind this
   // string.  This is a no-op unless the string is a ConsString.  Flatten
   // mutates the ConsString and might return a failure.
   MUST_USE_RESULT MaybeObject* SlowTryFlatten(PretenureFlag pretenure);
 
   // Slow case of String::Equals.  This implementation works on any strings
   // but it is most efficient on strings that are almost flat.
@@ skipping 1458 matching lines @@
     } else {
       value &= ~(1 << bit_position);
     }
     return value;
   }
 };
 
 } }  // namespace v8::internal
 
 #endif  // V8_OBJECTS_H_