[builtins] implement Array.prototype[@@iterator] in TFJ builtins

src/heap-symbols.h

 // Copyright 2015 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_HEAP_SYMBOLS_H_
 #define V8_HEAP_SYMBOLS_H_
 
 #define INTERNALIZED_STRING_LIST(V)                                \
   V(anonymous_string, "anonymous")                                 \
   V(apply_string, "apply")                                         \
   V(arguments_string, "arguments")                                 \
   V(Arguments_string, "Arguments")                                 \
   V(arguments_to_string, "[object Arguments]")                     \
   V(Array_string, "Array")                                         \
+  V(ArrayIterator_string, "Array Iterator")                        \
   V(assign_string, "assign")                                       \
   V(array_to_string, "[object Array]")                             \
   V(boolean_to_string, "[object Boolean]")                         \
   V(date_to_string, "[object Date]")                               \
   V(error_to_string, "[object Error]")                             \
   V(function_to_string, "[object Function]")                       \
   V(number_to_string, "[object Number]")                           \
   V(object_to_string, "[object Object]")                           \
   V(regexp_to_string, "[object RegExp]")                           \
   V(string_to_string, "[object String]")                           \
@@ skipping 64 matching lines @@
   V(int16x8_string, "int16x8")                                     \
   V(Int16x8_string, "Int16x8")                                     \
   V(int32x4_string, "int32x4")                                     \
   V(Int32x4_string, "Int32x4")                                     \
   V(int8x16_string, "int8x16")                                     \
   V(Int8x16_string, "Int8x16")                                     \
   V(isExtensible_string, "isExtensible")                           \
   V(isView_string, "isView")                                       \
   V(KeyedLoadMonomorphic_string, "KeyedLoadMonomorphic")           \
   V(KeyedStoreMonomorphic_string, "KeyedStoreMonomorphic")         \
+  V(keys_string, "keys")                                           \
   V(lastIndex_string, "lastIndex")                                 \
   V(length_string, "length")                                       \
   V(line_string, "line")                                           \
   V(literal_string, "literal")                                     \
   V(Map_string, "Map")                                             \
   V(message_string, "message")                                     \
   V(minus_infinity_string, "-Infinity")                            \
   V(minus_zero_string, "-0")                                       \
   V(minute_string, "minute")                                       \
   V(month_string, "month")                                         \
@@ skipping 127 matching lines @@
 // Well-Known Symbols are "Public" symbols, which have a bit set which causes
 // them to produce an undefined value when a load results in a failed access
 // check. Because this behaviour is not specified properly as of yet, it only
 // applies to a subset of spec-defined Well-Known Symbols.
 #define WELL_KNOWN_SYMBOL_LIST(V)                           \
   V(has_instance_symbol, Symbol.hasInstance)                \
   V(is_concat_spreadable_symbol, Symbol.isConcatSpreadable) \
   V(to_string_tag_symbol, Symbol.toStringTag)
 
 #endif  // V8_HEAP_SYMBOLS_H_