Add explicit class checks: LoadVMField.

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 1106 matching lines @@
 LocationSummary* LoadVMFieldComp::MakeLocationSummary() const {
   return LocationSummary::Make(1,
                                Location::RequiresRegister(),
                                LocationSummary::kNoCall);
 }
 
 
 void LoadVMFieldComp::EmitNativeCode(FlowGraphCompiler* compiler) {
   Register instance_reg = locs()->in(0).reg();
   Register result_reg = locs()->out().reg();
-  if (HasICData()) {
-    ASSERT(original() != NULL);
-    Label* deopt = compiler->AddDeoptStub(original()->deopt_id(),
-                                          kDeoptInstanceGetterSameTarget);
-    // Smis do not have instance fields (Smi class is always first).
-    // Use 'result' as temporary register.
-    ASSERT(result_reg != instance_reg);
-    ASSERT(ic_data() != NULL);
-    compiler->EmitClassChecksNoSmi(*ic_data(), instance_reg, result_reg, deopt);
-  }
 
   __ movq(result_reg, FieldAddress(instance_reg, offset_in_bytes()));
 }
 
 
 LocationSummary* InstantiateTypeArgumentsComp::MakeLocationSummary() const {
   const intptr_t kNumInputs = 1;
   const intptr_t kNumTemps = 0;
   LocationSummary* locs =
       new LocationSummary(kNumInputs, kNumTemps, LocationSummary::kCall);
@@ skipping 1086 matching lines @@
   }
   __ j(ABOVE_EQUAL, deopt);
 }
 
 
 }  // namespace dart
 
 #undef __
 
 #endif  // defined TARGET_ARCH_X64