Implement closure with type arguments.

runtime/vm/flow_graph_compiler_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/flow_graph_compiler.h"
 
 #include "vm/ast_printer.h"
@@ skipping 617 matching lines @@
 
 void FlowGraphCompiler::VisitCreateClosure(CreateClosureComp* comp) {
   const Function& function = comp->function();
   const Code& stub = Code::Handle(
       StubCode::GetAllocationStubForClosure(function));
   const ExternalLabel label(function.ToCString(), stub.EntryPoint());
   GenerateCall(comp->token_index(), &label, PcDescriptors::kOther);
 
   const Class& cls = Class::Handle(function.signature_class());
   if (cls.HasTypeArguments()) {
-    UNIMPLEMENTED();  // We should have bailed out.
     __ popq(RCX);  // Discard type arguments.
   }
   if (function.IsImplicitInstanceClosureFunction()) {
     __ popq(RCX);  // Discard receiver.
   }
 }
 
 
 void FlowGraphCompiler::VisitNativeLoadField(NativeLoadFieldComp* comp) {
   __ popq(RAX);
@@ skipping 632 matching lines @@
 void FlowGraphCompiler::FinalizeExceptionHandlers(const Code& code) {
   // We don't compile exception handlers yet.
   code.set_exception_handlers(
       ExceptionHandlers::Handle(ExceptionHandlers::New(0)));
 }
 
 
 }  // namespace dart
 
 #endif  // defined TARGET_ARCH_X64