[debugger] Further stepping support in test wrapper

test/mjsunit/debug-optimize.js

-// 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.
-
-// Flags: --expose-debug-as debug --allow-natives-syntax --use-inlining
-
-var Debug = debug.Debug;
-
-function f1() {
-  return 1;
-}
-
-function f2() {
-  return 2;
-}
-
-function f3() {
-  return f1();
-}
-
-function f4() {
-  return 4;
-}
-
-
-function optimize(f) {
-  f();
-  f();
-  %OptimizeFunctionOnNextCall(f);
-  f();
-}
-
-optimize(f1);
-optimize(f2);
-optimize(f3);
-
-Debug.setListener(function() {});
-
-assertOptimized(f1);
-assertOptimized(f2);
-assertOptimized(f3);
-
-Debug.setBreakPoint(f1, 1);
-
-// Setting break point deoptimizes f1 and f3 (which inlines f1).
-assertUnoptimized(f1);
-assertOptimized(f2);
-assertUnoptimized(f3);
-
-// We can optimize with break points set.
-optimize(f4);
-assertOptimized(f4);
-
-Debug.setListener(null);