Replace linked list of loaded libraries

runtime/vm/code_generator_test.cc

Index: runtime/vm/code_generator_test.cc
===================================================================
--- runtime/vm/code_generator_test.cc	(revision 7922)
+++ runtime/vm/code_generator_test.cc	(working copy)
@@ -488,8 +488,14 @@
   Object& result = Object::Handle();
   result = DartEntry::InvokeStatic(function, arguments, kNoArgumentNames);
   EXPECT(!result.IsError());
-  const Library& app_lib = Library::Handle(
-      Isolate::Current()->object_store()->registered_libraries());
+  const GrowableObjectArray& libs =  GrowableObjectArray::Handle(
+      Isolate::Current()->object_store()->libraries());
+  ASSERT(!libs.IsNull());
+  // App lib is the last one that was loaded.
+  intptr_t num_libs = libs.Length();
+  Library& app_lib = Library::Handle();
+  app_lib ^= libs.At(num_libs - 1);
+  ASSERT(!app_lib.IsNull());
   const Class& cls = Class::Handle(
       app_lib.LookupClass(String::Handle(String::NewSymbol("A"))));
   EXPECT_EQ(cls.raw(), result.clazz());