Rename Closure instance field type_arguments_ to instantiator_.

runtime/vm/precompiler.cc

 // Copyright (c) 2015, 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/precompiler.h"
 
 #include "vm/aot_optimizer.h"
 #include "vm/assembler.h"
 #include "vm/ast_printer.h"
 #include "vm/branch_optimizer.h"
@@ skipping 1090 matching lines @@
 void Precompiler::AddConstObject(const Instance& instance) {
   const Class& cls = Class::Handle(Z, instance.clazz());
   AddInstantiatedClass(cls);
 
   if (instance.IsClosure()) {
     // An implicit static closure.
     const Function& func =
         Function::Handle(Z, Closure::Cast(instance).function());
     ASSERT(func.is_static());
     AddFunction(func);
-    AddTypeArguments(TypeArguments::Handle(Z, instance.GetTypeArguments()));
+    AddTypeArguments(
+        TypeArguments::Handle(Z, Closure::Cast(instance).instantiator()));
     return;
   }
 
   // Can't ask immediate objects if they're canoncial.
   if (instance.IsSmi()) return;
 
   // Some Instances in the ObjectPool aren't const objects, such as
   // argument descriptors.
   if (!instance.IsCanonical()) return;
 
@@ skipping 2432 matching lines @@
 
   ASSERT(FLAG_precompiled_mode);
   const bool optimized = function.IsOptimizable();  // False for natives.
   DartPrecompilationPipeline pipeline(zone, field_type_map);
   return PrecompileFunctionHelper(precompiler, &pipeline, function, optimized);
 }
 
 #endif  // DART_PRECOMPILER
 
 }  // namespace dart