[debugger] fix blacklisted tests.

test/mjsunit/regress/regress-5071.js

Index: test/mjsunit/regress/regress-5071.js
diff --git a/test/mjsunit/regress/regress-5071.js b/test/mjsunit/regress/regress-5071.js
index 41c12500316a9c7a5fee5877c87e08a05da610f8..7a0cb3ea93916a4ed0a376b594b8dafc7c9b8615 100644
--- a/test/mjsunit/regress/regress-5071.js
+++ b/test/mjsunit/regress/regress-5071.js
@@ -5,16 +5,20 @@
 // Flags: --expose-debug-as debug
 
 var Debug = debug.Debug;
+var exception = null;
 
 function listener(event, exec_state, event_data, data) {
-  assertEquals(2, exec_state.frameCount());
-  assertEquals("a", exec_state.frame(0).localName(0));
-  assertEquals("1", exec_state.frame(0).localValue(0).value());
-  assertEquals(1, exec_state.frame(0).localCount());
+  if (event != Debug.DebugEvent.Break) return;
+  try {
+    assertEquals(2, exec_state.frameCount());
+    assertEquals("a", exec_state.frame(0).localName(0));
+    assertEquals(1, exec_state.frame(0).localValue(0).value());
+    assertEquals(1, exec_state.frame(0).localCount());
+  } catch (e) {
+    exception = e;
+  }
 }
 
-Debug.setListener(listener);
-
 function f() {
   var a = 1;
   {
@@ -23,4 +27,7 @@ function f() {
   }
 }
 
+Debug.setListener(listener);
 f();
+Debug.setListener(null);
+assertNull(exception);