[builtins] move String.prototype[@@iterator] to C++ builtin

src/factory.h

 // 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.
 
 #ifndef V8_FACTORY_H_
 #define V8_FACTORY_H_
 
 #include "src/isolate.h"
 #include "src/messages.h"
 #include "src/type-feedback-vector.h"
@@ skipping 158 matching lines @@
       Vector<const char> str,
       PretenureFlag pretenure = NOT_TENURED);
 
   MUST_USE_RESULT MaybeHandle<String> NewStringFromTwoByte(
       Vector<const uc16> str,
       PretenureFlag pretenure = NOT_TENURED);
 
   MUST_USE_RESULT MaybeHandle<String> NewStringFromTwoByte(
       const ZoneVector<uc16>* str, PretenureFlag pretenure = NOT_TENURED);
 
+  Handle<JSStringIterator> NewJSStringIterator(Handle<String> string);
+
   // Allocates an internalized string in old space based on the character
   // stream.
   Handle<String> NewInternalizedStringFromUtf8(Vector<const char> str,
                                                int chars, uint32_t hash_field);
 
   Handle<String> NewOneByteInternalizedString(Vector<const uint8_t> str,
                                               uint32_t hash_field);
 
   Handle<String> NewOneByteInternalizedSubString(
       Handle<SeqOneByteString> string, int offset, int length,
@@ skipping 21 matching lines @@
       PretenureFlag pretenure = NOT_TENURED);
 
   // Creates a single character string where the character has given code.
   // A cache is used for Latin1 codes.
   Handle<String> LookupSingleCharacterStringFromCode(uint32_t code);
 
   // Create a new cons string object which consists of a pair of strings.
   MUST_USE_RESULT MaybeHandle<String> NewConsString(Handle<String> left,
                                                     Handle<String> right);
 
+  // Create or lookup a single characters tring made up of a utf16 surrogate
+  // pair.
+  Handle<String> NewSurrogatePairString(uint16_t lead, uint16_t trail);
+
   // Create a new string object which holds a proper substring of a string.
   Handle<String> NewProperSubString(Handle<String> str,
                                     int begin,
                                     int end);
 
   // Create a new string object which holds a substring of a string.
   Handle<String> NewSubString(Handle<String> str, int begin, int end) {
     if (begin == 0 && end == str->length()) return str;
     return NewProperSubString(str, begin, end);
   }
@@ skipping 267 matching lines @@
 
   // Creates a new on-heap JSTypedArray.
   Handle<JSTypedArray> NewJSTypedArray(ElementsKind elements_kind,
                                        size_t number_of_elements,
                                        PretenureFlag pretenure = NOT_TENURED);
 
   Handle<JSDataView> NewJSDataView();
   Handle<JSDataView> NewJSDataView(Handle<JSArrayBuffer> buffer,
                                    size_t byte_offset, size_t byte_length);
 
+  Handle<JSIteratorResult> NewJSIteratorResult(Handle<Object> value, bool done);
+
   Handle<JSMap> NewJSMap();
   Handle<JSSet> NewJSSet();
 
   // TODO(aandrey): Maybe these should take table, index and kind arguments.
   Handle<JSMapIterator> NewJSMapIterator();
   Handle<JSSetIterator> NewJSSetIterator();
 
   // Allocates a bound function.
   MaybeHandle<JSBoundFunction> NewJSBoundFunction(
       Handle<JSReceiver> target_function, Handle<Object> bound_this,
@@ skipping 245 matching lines @@
                                      FunctionMode function_mode);
 
   void SetStrictFunctionInstanceDescriptor(Handle<Map> map,
                                            FunctionMode function_mode);
 };
 
 }  // namespace internal
 }  // namespace v8
 
 #endif  // V8_FACTORY_H_