[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 };
+
+inline std::ostream& operator<<(std::ostream& os, IterationKind kind) {
+  switch (kind) {
+    case IterationKind::kKeys:
+      return os << "IterationKind::kKeys";
+    case IterationKind::kValues:
+      return os << "IterationKind::kValues";
+    case IterationKind::kEntries:
+      return os << "IterationKind::kEntries";
+  }
+  UNREACHABLE();
+  return os;
+}
+
 }  // namespace internal
 }  // namespace v8
 
+// Used by js-builtin-reducer to identify whether ReduceArrayIterator() is
+// reducing a JSArray method, or a JSTypedArray method.
+enum class ArrayIteratorKind { kArray, kTypedArray };
+
 namespace i = v8::internal;
 
 #endif  // V8_GLOBALS_H_