CPU: Fix crash on breakpoint add/trace enable

src/core/cpu_core.cpp

@@ -1770,7 +1770,8 @@ void UpdateDebugDispatcherFlag()
 
   Log_DevPrintf("%s debug dispatcher", use_debug_dispatcher ? "Now using" : "No longer using");
   g_state.use_debug_dispatcher = use_debug_dispatcher;
-  ExitExecution();
+  if (System::IsExecuting())
+    ExitExecution();
 }
 
 void ExitExecution()

src/core/system.cpp

@@ -337,6 +337,12 @@ bool System::IsValid()
   return s_state == State::Running || s_state == State::Paused;
 }
 
+bool System::IsExecuting()
+{
+  DebugAssert(IsValid());
+  return s_system_executing;
+}
+
 bool System::IsStartupCancelled()
 {
   return s_startup_cancelled.load();

src/core/system.h

@@ -139,6 +139,7 @@ bool IsExecutionInterrupted();
 bool IsPaused();
 bool IsShutdown();
 bool IsValid();
+bool IsExecuting();
 
 bool IsStartupCancelled();
 void CancelPendingStartup();