Introduce cache of resolved names in library

runtime/vm/resolver.cc

 // Copyright (c) 2011, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
 #include "vm/resolver.h"
 
 #include "vm/dart_entry.h"
 #include "vm/flags.h"
 #include "vm/isolate.h"
 #include "vm/object.h"
@@ skipping 132 matching lines @@
 
 RawFunction* Resolver::ResolveStatic(const Library& library,
                                      const String& class_name,
                                      const String& function_name,
                                      intptr_t num_arguments,
                                      const Array& argument_names) {
   ASSERT(!library.IsNull());
   Function& function = Function::Handle();
   if (class_name.IsNull() || (class_name.Length() == 0)) {
     // Check if we are referring to a top level function.
-    const Object& object = Object::Handle(library.LookupObject(function_name));
+    const Object& object = Object::Handle(library.ResolveName(function_name));
     if (!object.IsNull() && object.IsFunction()) {
       function ^= object.raw();
       if (!function.AreValidArguments(num_arguments, argument_names, NULL)) {
         if (FLAG_trace_resolving) {
           String& error_message = String::Handle();
           // Obtain more detailed error message.
           function.AreValidArguments(num_arguments,
                                      argument_names,
                                      &error_message);
           OS::Print("ResolveStatic error '%s': %s.\n",
@@ skipping 54 matching lines @@
       OS::Print("ResolveStatic error '%s': %s.\n",
                 function_name.ToCString(),
                 error_message.ToCString());
     }
     return Function::null();
   }
   return function.raw();
 }
 
 }  // namespace dart