[turbofan] Added the RoundInt64ToFloat64 instruction to TurboFan.

src/compiler/arm64/instruction-selector-arm64.cc

 // Copyright 2014 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 "src/compiler/instruction-selector-impl.h"
 #include "src/compiler/node-matchers.h"
 #include "src/compiler/node-properties.h"
 
 namespace v8 {
 namespace internal {
@@ skipping 1170 matching lines @@
 void InstructionSelector::VisitChangeFloat32ToFloat64(Node* node) {
   VisitRR(this, kArm64Float32ToFloat64, node);
 }
 
 
 void InstructionSelector::VisitChangeInt32ToFloat64(Node* node) {
   VisitRR(this, kArm64Int32ToFloat64, node);
 }
 
 
+void InstructionSelector::VisitRoundInt64ToFloat64(Node* node) {
+  VisitRR(this, kArm64Int64ToFloat64, node);
+}
+
+
 void InstructionSelector::VisitChangeUint32ToFloat64(Node* node) {
   VisitRR(this, kArm64Uint32ToFloat64, node);
 }
 
 
 void InstructionSelector::VisitChangeFloat64ToInt32(Node* node) {
   VisitRR(this, kArm64Float64ToInt32, node);
 }
 
 
@@ skipping 773 matching lines @@
          MachineOperatorBuilder::kFloat64RoundTruncate |
          MachineOperatorBuilder::kFloat64RoundTiesAway |
          MachineOperatorBuilder::kWord32ShiftIsSafe |
          MachineOperatorBuilder::kInt32DivIsSafe |
          MachineOperatorBuilder::kUint32DivIsSafe;
 }
 
 }  // namespace compiler
 }  // namespace internal
 }  // namespace v8