Bug 979867: Kill mixed sign comparison warning; r=lth

--HG--
extra : rebase_source : 91d3898d7716b3bfb36d20503d8d14b32b85152c

js/src/vm/SelfHosting.cpp

@@ -425,7 +425,7 @@ js::intrinsic_UnsafePutElements(JSContext *cx, unsigned argc, Value *vp)
 
         if (arrobj->is<TypedArrayObject>() || arrobj->is<TypedObject>()) {
             JS_ASSERT(!arrobj->is<TypedArrayObject>() || idx < arrobj->as<TypedArrayObject>().length());
-            JS_ASSERT(!arrobj->is<TypedObject>() || idx < arrobj->as<TypedObject>().length());
+            JS_ASSERT(!arrobj->is<TypedObject>() || idx < uint32_t(arrobj->as<TypedObject>().length()));
             RootedValue tmp(cx, args[elemi]);
             // XXX: Always non-strict.
             if (!JSObject::setElement(cx, arrobj, arrobj, idx, &tmp, false))