[builtins] implement JSBuiltinReducer for ArrayIteratorNext()

src/globals.h

 // Copyright 2012 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_GLOBALS_H_
 #define V8_GLOBALS_H_
 
 #include <stddef.h>
 #include <stdint.h>
 
@@ skipping 1261 matching lines @@
   switch (encoding) {
     case UnicodeEncoding::UTF16:
       return os << "UTF16";
     case UnicodeEncoding::UTF32:
       return os << "UTF32";
   }
   UNREACHABLE();
   return os;
 }
 
+enum class IterationKind { kKeys, kValues, kEntries };
+
 }  // namespace internal
 }  // namespace v8
 
 namespace i = v8::internal;
 
 #endif  // V8_GLOBALS_H_