Follow jsc on not throwing when trying to add a property to a non-extensible object.

test/mjsunit/object-freeze.js

Index: test/mjsunit/object-freeze.js
===================================================================
--- test/mjsunit/object-freeze.js	(revision 7276)
+++ test/mjsunit/object-freeze.js	(working copy)
@@ -70,12 +70,8 @@
 assertFalse(Object.isExtensible(obj));
 assertTrue(Object.isFrozen(obj));
 
-try {
-   obj.foo = 42;
-   assertUnreachable();
-} catch(e) {
-  assertTrue(/object is not extensible/.test(e));
-}
+obj.foo = 42;
+assertEquals(obj.foo, undefined);
 
 desc = Object.getOwnPropertyDescriptor(obj, 'x');
 assertFalse(desc.writable);
@@ -88,7 +84,7 @@
 assertEquals("foobar", desc.value);
 
 // Make sure that even if we try overwrite a value that is not writable, it is
-// not changed. 
+// not changed.
 obj.x = "tete";
 assertEquals(42, obj.x);
 obj.x = { get: function() {return 43}, set: function() {} };
@@ -118,12 +114,8 @@
 assertEquals(set, desc.set);
 assertEquals(get, desc.get);
 
-try {
-  obj2.foo = 42;
-  assertUnreachable();
-} catch(e) {
-  assertTrue(/object is not extensible/.test(e));
-}
+obj2.foo = 42;
+assertEquals(obj2.foo, undefined);
 
 
 // Test freeze on arrays.