Debugger: clean up debug events.

src/debug.cc

Index: src/debug.cc
diff --git a/src/debug.cc b/src/debug.cc
index 25407a746fc5a61b6e58e7e2fd1367427bb160f3..e6077d1deeb577aa0c473033b22c9644501755c8 100644
--- a/src/debug.cc
+++ b/src/debug.cc
@@ -2824,21 +2824,18 @@ void Debug::NotifyMessageHandler(v8::DebugEvent event,
   bool sendEventMessage = false;
   switch (event) {
     case v8::Break:
-    case v8::BreakForCommand:
       sendEventMessage = !auto_continue;
       break;
-    case v8::Exception:
-      sendEventMessage = true;
-      break;
+    case v8::NewFunction:
     case v8::BeforeCompile:
+    case v8::CompileError:
+    case v8::PromiseEvent:
+    case v8::AsyncTaskEvent:
       break;
+    case v8::Exception:
     case v8::AfterCompile:
       sendEventMessage = true;
       break;
-    case v8::NewFunction:
-      break;
-    default:
-      UNREACHABLE();
   }
 
   // The debug command interrupt flag might have been set when the command was