Added %_NewConsString intrinsic.

src/factory.cc

 // Copyright 2014 the V8 project authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "src/factory.h"
 
 #include "src/allocation-site-scopes.h"
 #include "src/base/bits.h"
 #include "src/conversions.h"
 #include "src/isolate-inl.h"
@@ skipping 520 matching lines @@
       return result;
     }
 
     return (is_one_byte_data_in_two_byte_string)
         ? ConcatStringContent<uint8_t>(
             NewRawOneByteString(length).ToHandleChecked(), left, right)
         : ConcatStringContent<uc16>(
             NewRawTwoByteString(length).ToHandleChecked(), left, right);
   }
 
-  Handle<Map> map = (is_one_byte || is_one_byte_data_in_two_byte_string)
-                        ? cons_one_byte_string_map()
-                        : cons_string_map();
-  Handle<ConsString> result =  New<ConsString>(map, NEW_SPACE);
+  return (is_one_byte || is_one_byte_data_in_two_byte_string)
+             ? NewOneByteConsString(length, left, right)
+             : NewTwoByteConsString(length, left, right);
+}
+
+
+MaybeHandle<String> Factory::NewOneByteConsString(int length,
+                                                  Handle<String> left,
+                                                  Handle<String> right) {
+  return NewRawConsString(cons_one_byte_string_map(), length, left, right);
+}
+
+
+MaybeHandle<String> Factory::NewTwoByteConsString(int length,
+                                                  Handle<String> left,
+                                                  Handle<String> right) {
+  return NewRawConsString(cons_string_map(), length, left, right);
+}
+
+
+MaybeHandle<String> Factory::NewRawConsString(Handle<Map> map, int length,
+                                              Handle<String> left,
+                                              Handle<String> right) {
+  Handle<ConsString> result = New<ConsString>(map, NEW_SPACE);
 
   DisallowHeapAllocation no_gc;
   WriteBarrierMode mode = result->GetWriteBarrierMode(no_gc);
 
   result->set_hash_field(String::kEmptyHashField);
   result->set_length(length);
   result->set_first(*left, mode);
   result->set_second(*right, mode);
   return result;
 }
@@ skipping 1759 matching lines @@
   return Handle<Object>::null();
 }
 
 
 Handle<Object> Factory::ToBoolean(bool value) {
   return value ? true_value() : false_value();
 }
 
 
 } }  // namespace v8::internal