[inspector] change target promise for kDebugWillHandle & kDebugDidHandle

test/inspector/debugger/async-instrumentation.js

 // Copyright 2016 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.
 
 print('Checks async instrumentation enabled in the middle.');
 
 InspectorTest.addScript(`
 function foo() {
   // asyncTaskStarted
   debugger;
   // asyncTaskFinished
   debugger;
 }
 
 function test() {
+  debugger;
   var resolve1;
   var p1 = new Promise(resolve => resolve1 = resolve);
   var p2 = p1.then(foo);
-  debugger;
   resolve1(); // asyncTaskScheduled
   debugger;
   return p2;
 }
 
 //# sourceURL=test.js`, 7, 26);
 
 InspectorTest.setupScriptMap();
 Protocol.Debugger.onPaused(message => {
   if (enableOnPause-- === 0)
@@ skipping 29 matching lines @@
   },
 
   function afterAsyncTaskStarted(next) {
     enableOnPause = 3;
     Protocol.Runtime.evaluate({ expression: 'test()//# sourceURL=expr1.js',
         awaitPromise: true })
       .then(() => Protocol.Debugger.setAsyncCallStackDepth({ maxDepth: 0 }))
       .then(next);
   }
 ]);