[builtins] implement JSBuiltinReducer for ArrayIteratorNext()

src/globals.h

Index: src/globals.h
diff --git a/src/globals.h b/src/globals.h
index 4a81c57073c6a074fadfe0e072a97172f8aa347d..5d8f3b670be7342c6d883fe07f6a30265f531054 100644
--- a/src/globals.h
+++ b/src/globals.h
@@ -1279,6 +1279,21 @@ 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