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

src/builtins/builtins.h

 // Copyright 2011 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_BUILTINS_BUILTINS_H_
 #define V8_BUILTINS_BUILTINS_H_
 
 #include "src/base/flags.h"
 #include "src/handles.h"
 
@@ skipping 358 matching lines @@
   CPP(GlobalEncodeURI)                                                        \
   CPP(GlobalEncodeURIComponent)                                               \
   CPP(GlobalEscape)                                                           \
   CPP(GlobalUnescape)                                                         \
   CPP(GlobalEval)                                                             \
   /* ES6 section 18.2.2 isFinite ( number ) */                                \
   TFJ(GlobalIsFinite, 2)                                                      \
   /* ES6 section 18.2.3 isNaN ( number ) */                                   \
   TFJ(GlobalIsNaN, 2)                                                         \
                                                                               \
+  /* ES6 #sec-%iteratorprototype%-@@iterator */                               \
+  TFJ(IteratorPrototypeIterator, 1)                                           \
+                                                                              \
   /* JSON */                                                                  \
   CPP(JsonParse)                                                              \
   CPP(JsonStringify)                                                          \
                                                                               \
   /* Math */                                                                  \
   /* ES6 section 20.2.2.1 Math.abs ( x ) */                                   \
   TFJ(MathAbs, 2)                                                             \
   /* ES6 section 20.2.2.2 Math.acos ( x ) */                                  \
   TFJ(MathAcos, 2)                                                            \
   /* ES6 section 20.2.2.3 Math.acosh ( x ) */                                 \
@@ skipping 153 matching lines @@
   CPP(StringPrototypeLocaleCompare)                                           \
   /* ES6 section 21.1.3.12 String.prototype.normalize ( [form] ) */           \
   CPP(StringPrototypeNormalize)                                               \
   /* ES6 section 21.1.3.25 String.prototype.toString () */                    \
   TFJ(StringPrototypeToString, 1)                                             \
   CPP(StringPrototypeTrim)                                                    \
   CPP(StringPrototypeTrimLeft)                                                \
   CPP(StringPrototypeTrimRight)                                               \
   /* ES6 section 21.1.3.28 String.prototype.valueOf () */                     \
   TFJ(StringPrototypeValueOf, 1)                                              \
+  /* ES6 #sec-string.prototype-@@iterator */                                  \
+  CPP(StringPrototypeIterator)                                                \
+                                                                              \
+  /* StringIterator */                                                        \
+  CPP(StringIteratorPrototypeNext)                                            \
                                                                               \
   /* Symbol */                                                                \
   CPP(SymbolConstructor)                                                      \
   CPP(SymbolConstructor_ConstructStub)                                        \
   /* ES6 section 19.4.3.4 Symbol.prototype [ @@toPrimitive ] ( hint ) */      \
   TFJ(SymbolPrototypeToPrimitive, 2)                                          \
   /* ES6 section 19.4.3.2 Symbol.prototype.toString ( ) */                    \
   TFJ(SymbolPrototypeToString, 1)                                             \
   /* ES6 section 19.4.3.3 Symbol.prototype.valueOf ( ) */                     \
   TFJ(SymbolPrototypeValueOf, 1)                                              \
@@ skipping 148 matching lines @@
 
   friend class Isolate;
 
   DISALLOW_COPY_AND_ASSIGN(Builtins);
 };
 
 }  // namespace internal
 }  // namespace v8
 
 #endif  // V8_BUILTINS_BUILTINS_H_