[inspector] fixed suspended-generator-scopes.js with --aways-opt

test/inspector/debugger/suspended-generator-scopes.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.
 
 InspectorTest.addScript(
 `function *gen(a) {
   var b = 42;
   yield a;
   return b;
 }
 function testSuspendedGenerator()
 {
   var g = gen(420);
   g.next();
 
   debugger;
+  return g;
 }`);
 
 Protocol.Debugger.enable().then(testSuite);
 
 function dumpInnermostScope(msg) {
   var scopes = msg.result.result;
   var inner_scope = scopes[0].value;
   return Protocol.Runtime.getProperties({ objectId : inner_scope.objectId })
       .then(InspectorTest.logMessage);
 }
@@ skipping 42 matching lines @@
     },
 
     function testScopesNonPaused(next) {
       Protocol.Runtime.evaluate({ expression : "gen(430)"})
           .then(msg => fetchGeneratorProperties(msg.result.result.objectId))
           .then(dumpGeneratorScopes)
           .then(next);
     },
   ]);
 }