[arm64] Fixed unnecessary environment assignment to LSmiTag instruction.

src/arm64/lithium-arm64.cc

 // Copyright 2013 the V8 project authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include <sstream>
 
 #include "src/v8.h"
 
 #include "src/arm64/lithium-codegen-arm64.h"
 #include "src/hydrogen-osr.h"
@@ skipping 1185 matching lines @@
         return AssignPointerMap(DefineAsRegister(result));
       } else {
         STATIC_ASSERT((kMinInt == Smi::kMinValue) &&
                       (kMaxInt == Smi::kMaxValue));
         LOperand* value = UseRegisterAtStart(val);
         return DefineAsRegister(new(zone()) LSmiTag(value));
       }
     } else if (to.IsSmi()) {
       LOperand* value = UseRegisterAtStart(val);
       LInstruction* result = DefineAsRegister(new(zone()) LSmiTag(value));
-      if (val->CheckFlag(HInstruction::kUint32)) {
+      if (instr->CheckFlag(HValue::kCanOverflow)) {
         result = AssignEnvironment(result);
       }
       return result;
     } else {
       DCHECK(to.IsDouble());
       if (val->CheckFlag(HInstruction::kUint32)) {
         return DefineAsRegister(
             new(zone()) LUint32ToDouble(UseRegisterAtStart(val)));
       } else {
         return DefineAsRegister(
@@ skipping 1566 matching lines @@
   LOperand* context = UseFixed(instr->context(), cp);
   LOperand* function = UseRegisterAtStart(instr->function());
   LAllocateBlockContext* result =
       new(zone()) LAllocateBlockContext(context, function);
   return MarkAsCall(DefineFixed(result, cp), instr);
 }
 
 
 }  // namespace internal
 }  // namespace v8