Added back some utf8 optimizations

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 2624 matching lines @@
         continue;
 
       default:
         UNREACHABLE();
         return;
     }
   }
 }
 
 
+// TODO(dcarney): Remove this class after conversion to VisitFlat.
+class ConsStringCaptureOp {
+ public:
+  inline ConsStringCaptureOp() : cons_string_(NULL) {}
+  inline String* Operate(String* string, unsigned*, int32_t*, unsigned*) {
+    cons_string_ = ConsString::cast(string);
+    return NULL;
+  }
+  ConsString* cons_string_;
+};
+
+
+template<class Visitor>
+ConsString* String::VisitFlat(Visitor* visitor,
+                              String* string,
+                              int offset,
+                              int length,
+                              int32_t type) {
+  ASSERT(length >= 0 && length == string->length());
+  ASSERT(offset >= 0 && offset <= length);
+  ConsStringCaptureOp op;
+  Visit(string, offset, *visitor, op, type, static_cast<unsigned>(length));
+  return op.cons_string_;
+}
+
+
 uint16_t SeqOneByteString::SeqOneByteStringGet(int index) {
   ASSERT(index >= 0 && index < length());
   return READ_BYTE_FIELD(this, kHeaderSize + index * kCharSize);
 }
 
 
 void SeqOneByteString::SeqOneByteStringSet(int index, uint16_t value) {
   ASSERT(index >= 0 && index < length() && value <= kMaxOneByteCharCode);
   WRITE_BYTE_FIELD(this, kHeaderSize + index * kCharSize,
                    static_cast<byte>(value));
@@ skipping 3292 matching lines @@
 #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_