Fix misoptimization of 'is' test

runtime/vm/optimizer.h

Index: runtime/vm/optimizer.h
diff --git a/runtime/vm/optimizer.h b/runtime/vm/optimizer.h
new file mode 100644
index 0000000000000000000000000000000000000000..188dcbcd4d85581765b425415bcb8531bd30b1f9
--- /dev/null
+++ b/runtime/vm/optimizer.h
@@ -0,0 +1,23 @@
+// Copyright (c) 2017, the Dart project authors.  Please see the AUTHORS file
+// for details. All rights reserved. Use of this source code is governed by a
+// BSD-style license that can be found in the LICENSE file.
+
+#ifndef RUNTIME_VM_OPTIMIZER_H_
+#define RUNTIME_VM_OPTIMIZER_H_
+
+#include "vm/globals.h"
+
+#include "vm/growable_array.h"
+
+namespace dart {
+
+class Optimizer {
+ public:
+  static bool TryExpandTestCidsResult(ZoneGrowableArray<intptr_t>* results,

[Vyacheslav Egorov (Google), 2017/05/23 16:00:32]

Maybe this function name needs to reflect more closely what it is doing, e.g.

SpecializeTestCidForNumericType()

or something like that.

[erikcorry, 2017/05/24 13:37:16]

Done.

+                                      const AbstractType& type,
+                                      bool int_type_only);
+};
+
+}  // namespace dart
+
+#endif  // RUNTIME_VM_OPTIMIZER_H_