This is https://chromiumcodereview.appspot.com/10581006/ that I forgot to submit, and messed up the…

runtime/vm/intermediate_language_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/intermediate_language.h"
 
 #include "lib/error.h"
@@ skipping 1586 matching lines @@
   return summary;
 }
 
 
 void UnarySmiOpComp::EmitNativeCode(FlowGraphCompiler* compiler) {
   const ICData& ic_data = *instance_call()->ic_data();
   ASSERT(!ic_data.IsNull());
   ASSERT(ic_data.num_args_tested() == 1);
   // TODO(srdjan): Implement for more checks.
   ASSERT(ic_data.NumberOfChecks() == 1);
-  Class& test_class = Class::Handle();
+  intptr_t test_class_id;
   Function& target = Function::Handle();
-  ic_data.GetOneClassCheckAt(0, &test_class, &target);
+  ic_data.GetOneClassCheckAt(0, &test_class_id, &target);
 
   Register value = locs()->in(0).reg();
   Register result = locs()->out().reg();
   ASSERT(value == result);
   Label* deopt = compiler->AddDeoptStub(instance_call()->cid(),
                                         instance_call()->token_index(),
                                         instance_call()->try_index(),
                                         kDeoptSmiBinaryOp,
                                         value);
-  if (test_class.id() == kSmi) {
+  if (test_class_id == kSmi) {
     __ testq(value, Immediate(kSmiTagMask));
     __ j(NOT_ZERO, deopt);
     switch (op_kind()) {
       case Token::kNEGATE:
         __ negq(value);
         __ j(OVERFLOW, deopt);
         break;
       case Token::kBIT_NOT:
         __ notq(value);
         __ andq(value, Immediate(~kSmiTagMask));  // Remove inverted smi-tag.
@@ skipping 20 matching lines @@
 }
 
 
 void NumberNegateComp::EmitNativeCode(FlowGraphCompiler* compiler) {
   const ICData& ic_data = *instance_call()->ic_data();
   ASSERT(!ic_data.IsNull());
   ASSERT(ic_data.num_args_tested() == 1);
 
   // TODO(srdjan): Implement for more checks.
   ASSERT(ic_data.NumberOfChecks() == 1);
-  Class& test_class = Class::Handle();
+  intptr_t test_class_id;
   Function& target = Function::Handle();
-  ic_data.GetOneClassCheckAt(0, &test_class, &target);
+  ic_data.GetOneClassCheckAt(0, &test_class_id, &target);
 
   Register value = locs()->in(0).reg();
   Register result = locs()->out().reg();
   ASSERT(value == result);
   Label* deopt = compiler->AddDeoptStub(instance_call()->cid(),
                                         instance_call()->token_index(),
                                         instance_call()->try_index(),
                                         kDeoptSmiBinaryOp,
                                         value);
-  if (test_class.id() == kDouble) {
+  if (test_class_id == kDouble) {
     Register temp = locs()->temp(0).reg();
     __ testq(value, Immediate(kSmiTagMask));
     __ j(ZERO, deopt);  // Smi.
     __ CompareClassId(value, kDouble);
     __ j(NOT_EQUAL, deopt);
     // Allocate result object.
     const Class& double_class = compiler->double_class();
     const Code& stub =
         Code::Handle(StubCode::GetAllocationStubForClass(double_class));
     const ExternalLabel label(double_class.ToCString(), stub.EntryPoint());
@@ skipping 120 matching lines @@
                                  instance_call()->argument_names());
   }
   __ Bind(&done);
 }
 
 }  // namespace dart
 
 #undef __
 
 #endif  // defined TARGET_ARCH_X64