[debug] Disable debug events if JS execution is disallowed

test/debugger/debug/regress/regress-662674.js

Index: test/debugger/debug/regress/regress-662674.js
diff --git a/test/debugger/debug/regress/regress-662674.js b/test/debugger/debug/regress/regress-662674.js
new file mode 100644
index 0000000000000000000000000000000000000000..46054a5cd97880e9c45f8162ef6549d2cdfbd0fc
--- /dev/null
+++ b/test/debugger/debug/regress/regress-662674.js
@@ -0,0 +1,14 @@
+// Copyright 2016 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.
+
+// Flags: --stack-size=100
+
+Debug = debug.Debug
+
+function overflow() {
+  return overflow();
+}
+
+Debug.setBreakOnException();
+assertThrows(overflow, RangeError);