Fix --noopt to not optimize

test/mjsunit/noopt.js

+// Copyright 2017 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.
+
+// Flags: --allow-natives-syntax --noopt --no-always-opt
+
+
+// Check that --noopt actually works.
+
+function f() { return 42; }
+
+f();
+f();
+%OptimizeFunctionOnNextCall(f);
+f();
+
+assertUnoptimized(f);