[debugger] fix stepping out of across throwing.

src/debug/debug.cc

 // Copyright 2012 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 "src/debug/debug.h"
 
 #include <memory>
 
 #include "src/api.h"
 #include "src/arguments.h"
@@ skipping 918 matching lines @@
   ClearOneShot();
 
   // Iterate through the JavaScript stack looking for handlers.
   JavaScriptFrameIterator it(isolate_);
   while (!it.done()) {
     JavaScriptFrame* frame = it.frame();
     if (frame->LookupExceptionHandlerInTable(nullptr, nullptr) > 0) break;
     it.Advance();
   }
 
-  if (last_step_action() == StepNext) {
+  if (last_step_action() == StepNext || last_step_action() == StepOut) {
     while (!it.done()) {
       Address current_fp = it.frame()->UnpaddedFP();
       if (current_fp >= thread_local_.target_fp_) break;
       it.Advance();
     }
   }
 
   // Find the closest Javascript frame we can flood with one-shots.
   while (!it.done() &&
          !it.frame()->function()->shared()->IsSubjectToDebugging()) {
@@ skipping 1611 matching lines @@
 }
 
 
 void LockingCommandMessageQueue::Clear() {
   base::LockGuard<base::Mutex> lock_guard(&mutex_);
   queue_.Clear();
 }
 
 }  // namespace internal
 }  // namespace v8