Fix a number of tests that incorrectly used assertUnreachable.

test/mjsunit/regress/regress-1130.js

Index: test/mjsunit/regress/regress-1130.js
diff --git a/test/mjsunit/regress/regress-1130.js b/test/mjsunit/regress/regress-1130.js
index 188f3f9214820691a9f989415ff3db59f9b46394..07d5e3d46727e4f8fef105dd895f205d33200a56 100644
--- a/test/mjsunit/regress/regress-1130.js
+++ b/test/mjsunit/regress/regress-1130.js
@@ -30,9 +30,11 @@
 
 Object.prototype.__defineGetter__(0, function() { throw 42; } );
 
+var exception = false;
 try {
   eval("(function() { const x; var x })")();
-  assertUnreachable();
 } catch (e) {
+  exception = true;
   assertTrue(e instanceof TypeError);
 }
+assertTrue(exception);