Remove an unused input operand from ExtractConstructorInstantiator.

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 "lib/error.h"
@@ skipping 1000 matching lines @@
   // instantiate the type arguments.
   __ LoadObject(RAX, comp->type_arguments());
   // RAX: uninstantiated type arguments.
   __ Bind(&type_arguments_instantiated);
   // RAX: uninstantiated or instantiated type arguments.
 }
 
 
 void FlowGraphCompiler::VisitExtractConstructorInstantiator(
     ExtractConstructorInstantiatorComp* comp) {
-  __ popq(RCX);  // Discard value.
-  __ popq(RAX);  // Instantiator.
+  ASSERT(comp->instantiator()->IsUse());
+  LoadValue(RAX, comp->instantiator());
 
   // RAX is the instantiator AbstractTypeArguments object (or null).
   // If the instantiator is null and if the type argument vector
   // instantiated from null becomes a vector of Dynamic, then use null as
   // the type arguments and do not pass the instantiator.
   Label done;
   const intptr_t len = comp->type_arguments().Length();
   if (comp->type_arguments().IsRawInstantiatedRaw(len)) {
     const Immediate raw_null =
         Immediate(reinterpret_cast<intptr_t>(Object::null()));
@@ skipping 664 matching lines @@
   ASSERT(exception_handlers_list_ != NULL);
   const ExceptionHandlers& handlers = ExceptionHandlers::Handle(
       exception_handlers_list_->FinalizeExceptionHandlers(code.EntryPoint()));
   code.set_exception_handlers(handlers);
 }
 
 
 }  // namespace dart
 
 #endif  // defined TARGET_ARCH_X64