Store resolved library prefix in unresolved class object in order not to repeat

runtime/vm/code_generator_x64.cc

 // Copyright (c) 2012, 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/globals.h"  // Needed here to get TARGET_ARCH_X64.
 #if defined(TARGET_ARCH_X64)
 
 #include "vm/code_generator.h"
 
 #include "lib/error.h"
@@ skipping 2280 matching lines @@
 
 
 // Pushes the type arguments of the instantiator on the stack.
 void CodeGenerator::GenerateInstantiatorTypeArguments(intptr_t token_index) {
   const Class& instantiator_class = Class::Handle(
       parsed_function().function().owner());
   if (instantiator_class.NumTypeParameters() == 0) {
     // The type arguments are compile time constants.
     AbstractTypeArguments& type_arguments = AbstractTypeArguments::ZoneHandle();
     // TODO(regis): Temporary type should be allocated in new gen heap.
-    Type& type = Type::Handle(
-        Type::NewParameterizedType(instantiator_class, type_arguments));
+    Type& type = Type::Handle(Type::New(instantiator_class, type_arguments));
     Error& error = Error::Handle();
     type ^= ClassFinalizer::FinalizeAndCanonicalizeType(instantiator_class,
                                                         type,
                                                         &error);
     if (!error.IsNull()) {
       ErrorMsg(token_index, error.ToErrorCString());
     }
     type_arguments = type.arguments();
     __ PushObject(type_arguments);
   } else {
@@ skipping 481 matching lines @@
   const Error& error = Error::Handle(
       Parser::FormatError(script, token_index, "Error", format, args));
   va_end(args);
   Isolate::Current()->long_jump_base()->Jump(1, error);
   UNREACHABLE();
 }
 
 }  // namespace dart
 
 #endif  // defined TARGET_ARCH_X64