Change the handling of the debug break stack guard

src/debug.cc

Index: src/debug.cc
===================================================================
--- src/debug.cc	(revision 2070)
+++ src/debug.cc	(working copy)
@@ -443,7 +443,7 @@
   thread_local_.step_into_fp_ = 0;
   thread_local_.after_break_target_ = 0;
   thread_local_.debugger_entry_ = NULL;
-  thread_local_.preemption_pending_ = false;
+  thread_local_.pending_interrupts_ = 0;
 }
 
 
@@ -727,7 +727,7 @@
 // Set the flag indicating that preemption happened during debugging.
 void Debug::PreemptionWhileInDebugger() {
   ASSERT(InDebugger());
-  Debug::set_preemption_pending(true);
+  Debug::set_interrupts_pending(PREEMPT);
 }
 
 
@@ -1927,6 +1927,11 @@
                                  bool auto_continue) {
   HandleScope scope;
 
+  // Clear any pending debug break if this is a real break.
+  if (!auto_continue) {
+    Debug::clear_interrupt_pending(DEBUGBREAK);
+  }
+
   // Create the execution state.
   bool caught_exception = false;
   Handle<Object> exec_state = MakeExecutionState(&caught_exception);