Issue #1142 - Cleanup unused debug code for unboxed objects

Also fixes an assertion during compile if debug is enabled since unboxed objects have been removed.

js/src/jscompartment.cpp

@@ -112,13 +112,6 @@ JSCompartment::~JSCompartment()
     js_delete(nonSyntacticLexicalEnvironments_),
     js_free(enumerators);
 
-#ifdef DEBUG
-    // Avoid assertion destroying the unboxed layouts list if the embedding
-    // leaked GC things.
-    if (!rt->gc.shutdownCollectedEverything())
-        unboxedLayouts.clear();
-#endif
-
     runtime_->numCompartments--;
 }