[builtins] implement JSBuiltinReducer for ArrayIteratorNext()

src/globals.h

Index: src/globals.h
diff --git a/src/globals.h b/src/globals.h
index f0d2f27c1e372e25ffb75264da39a289458ef20b..f689c667b6cd3621d1a0b81d71c34aa9707a8853 100644
--- a/src/globals.h
+++ b/src/globals.h
@@ -1279,9 +1279,28 @@ inline std::ostream& operator<<(std::ostream& os, UnicodeEncoding encoding) {
   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_