Fix a number of tests that incorrectly used assertUnreachable.

test/mjsunit/regress/regress-1132.js

 // Copyright 2011 the V8 project authors. All rights reserved.
 // Redistribution and use in source and binary forms, with or without
 // modification, are permitted provided that the following conditions are
 // met:
 //
 //     * Redistributions of source code must retain the above copyright
 //       notice, this list of conditions and the following disclaimer.
 //     * Redistributions in binary form must reproduce the above
 //       copyright notice, this list of conditions and the following
 //       disclaimer in the documentation and/or other materials provided
@@ skipping 23 matching lines @@
 
 function test() {
   try {
     test(1, test(1));
   } catch(e) {
     assertFalse(delete e, "deleting catch variable");
     assertEquals(42, e);
   }
 }
 
+var exception = false;
 try {
   test();
-  assertUnreachable();
 } catch (e) {
+  exception = true;
 }
+assertTrue(exception);