Fix a number of tests that incorrectly used assertUnreachable.

test/mjsunit/regress/regress-1160.js

Index: test/mjsunit/regress/regress-1160.js
diff --git a/test/mjsunit/regress/regress-1160.js b/test/mjsunit/regress/regress-1160.js
index 8e6e29bd4c49c7cfeee008ecb1d72a253f669114..10d3bc3ed28af83c98cfd5af68f138c242126dd2 100644
--- a/test/mjsunit/regress/regress-1160.js
+++ b/test/mjsunit/regress/regress-1160.js
@@ -32,15 +32,10 @@
 // when keyed store on the array does not work as expected because of
 // the setter on its prototype.
 
-try {
-  var N = 100;
-  var array = Array(N);
-  for (var i = 0; i < N; ++i) {
-    array[i] = i;
-  }
-  Array.prototype.__defineSetter__(32, function() { });
-  // The next line throws. We should make it work even with changed
-  // prototype. See http://code.google.com/p/v8/issues/detail?id=1161
-  array.join(",");
-  assertUnreachable();
-} catch (e) { }
+var N = 10;
+var array = Array(N);
+for (var i = 0; i < N; ++i) {
+  array[i] = i;
+}
+Array.prototype.__defineSetter__(2, function() { });
+assertEquals("0,1,2,3,4,5,6,7,8,9", array.join(","));