ES6: Object.setPrototypeOf(func, null) breaks instanceof

test/cctest/interpreter/test-bytecode-generator.cc

 // Copyright 2015 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.
 
 #include <fstream>
 
 #include "src/v8.h"
 
 #include "src/compiler.h"
 #include "src/interpreter/bytecode-array-iterator.h"
@@ skipping 542 matching lines @@
       "f();",
 
       "function f() { return %spread_iterable([1]) }\n"
       "f();",
   };
 
   CHECK_EQ(BuildActual(printer, snippets), LoadGolden("CallRuntime.golden"));
 }
 
 TEST(IfConditions) {
+  if (FLAG_harmony_instanceof) {
+    // TODO(mvstanton): when ES6 instanceof ships, regenerate the bytecode
+    // expectations and remove this flag check.
+    return;
+  }
   InitializedIgnitionHandleScope scope;
   BytecodeExpectationsPrinter printer(CcTest::isolate(),
                                       ConstantPoolType::kNumber);
   printer.set_wrap(false);
   printer.set_test_function_name("f");
 
   const char* snippets[] = {
     "function f() {\n"
     "  if (0) {\n"
     "    return 1;\n"
@@ skipping 1613 matching lines @@
       "})();\n",
   };
 
   CHECK_EQ(BuildActual(printer, snippets),
            LoadGolden("ClassAndSuperClass.golden"));
 }
 
 }  // namespace interpreter
 }  // namespace internal
 }  // namespace v8