Changed preemption related stuff in debugger entry

src/debug.h

 // Copyright 2006-2008 the V8 project authors. All rights reserved.
 // Redistribution and use in source and binary forms, with or without
 // modification, are permitted provided that the following conditions are
 // met:
 //
 //     * Redistributions of source code must retain the above copyright
 //       notice, this list of conditions and the following disclaimer.
 //     * Redistributions in binary form must reproduce the above
 //       copyright notice, this list of conditions and the following
 //       disclaimer in the documentation and/or other materials provided
@@ skipping 556 matching lines @@
 
 // This class is used for entering the debugger. Create an instance in the stack
 // to enter the debugger. This will set the current break state, make sure the
 // debugger is loaded and switch to the debugger context. If the debugger for
 // some reason could not be entered FailedToEnter will return true.
 class EnterDebugger BASE_EMBEDDED {
  public:
   EnterDebugger()
       : prev_(Debug::debugger_entry()),
         has_js_frames_(!it_.done()) {
-    ASSERT(!Debug::preemption_pending());
+    ASSERT(prev_ == NULL ? !Debug::preemption_pending() : true);
 
     // Link recursive debugger entry.
     Debug::set_debugger_entry(this);
 
-    // If a preemption is pending when first entering the debugger clear it as
-    // we don't want preemption happening while executing JavaScript in the
-    // debugger. When recursively entering the debugger the preemption flag
-    // cannot be set as this is disabled while in the debugger (see
-    // RuntimePreempt).
-    if (prev_ == NULL && StackGuard::IsPreempted()) {
-      StackGuard::Continue(PREEMPT);
-    }
-    ASSERT(!StackGuard::IsPreempted());
-
     // Store the previous break id and frame id.
     break_id_ = Debug::break_id();
     break_frame_id_ = Debug::break_frame_id();
 
     // Create the new break info. If there is no JavaScript frames there is no
     // break frame id.
     if (has_js_frames_) {
       Debug::NewBreak(it_.frame()->id());
     } else {
       Debug::NewBreak(StackFrame::NO_ID);
@@ skipping 103 matching lines @@
   }
  private:
   Debug::AddressId id_;
   int reg_;
 };
 
 
 } }  // namespace v8::internal
 
 #endif  // V8_V8_DEBUG_H_