Make %DebugPushPromise more robust wrt fuzzing.

test/mjsunit/regress/regress-crbug-401915.js

Index: test/mjsunit/regress/regress-crbug-401915.js
diff --git a/test/mjsunit/regress/regress-crbug-387599.js b/test/mjsunit/regress/regress-crbug-401915.js
similarity index 68%
copy from test/mjsunit/regress/regress-crbug-387599.js
copy to test/mjsunit/regress/regress-crbug-401915.js
index 98750aa918261f707bdee8a05d230c2805aa11e9..96dce048689cb28d9a095a8a5378503ffa4ae449 100644
--- a/test/mjsunit/regress/regress-crbug-387599.js
+++ b/test/mjsunit/regress/regress-crbug-401915.js
@@ -6,14 +6,15 @@
 
 Debug = debug.Debug;
 Debug.setListener(function() {});
+Debug.setBreakOnException();
 
-function f() {
-  for (var i = 0; i < 100; i++) {
-    %OptimizeFunctionOnNextCall(f, "osr");
+try {
+  try {
+    %DebugPushPromise(new Promise(function() {}));
+  } catch (e) {
   }
+  throw new Error();
+} catch (e) {
 }
 
-Debug.setBreakPoint(f, 0, 0);
-f();
-f();
 Debug.setListener(null);