[turbofan] Add the RoundInt32ToFloat32 operator to turbofan.

src/compiler/arm/instruction-selector-arm.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/base/adapters.h"
 #include "src/base/bits.h"
 #include "src/compiler/instruction-selector-impl.h"
 #include "src/compiler/node-matchers.h"
 #include "src/compiler/node-properties.h"
 
@@ skipping 903 matching lines @@
 void InstructionSelector::VisitUint32Mod(Node* node) {
   VisitMod(this, node, kArmUdiv, kArmVcvtF64U32, kArmVcvtU32F64);
 }
 
 
 void InstructionSelector::VisitChangeFloat32ToFloat64(Node* node) {
   VisitRR(this, kArmVcvtF64F32, node);
 }
 
 
+void InstructionSelector::VisitRoundInt32ToFloat32(Node* node) {
+  VisitRR(this, kArmVcvtF32S32, node);
+}
+
+
 void InstructionSelector::VisitChangeInt32ToFloat64(Node* node) {
   VisitRR(this, kArmVcvtF64S32, node);
 }
 
 
 void InstructionSelector::VisitChangeUint32ToFloat64(Node* node) {
   VisitRR(this, kArmVcvtF64U32, node);
 }
 
 
@@ skipping 667 matching lines @@
              MachineOperatorBuilder::kFloat64RoundTiesAway |
              MachineOperatorBuilder::kFloat32RoundTiesEven |
              MachineOperatorBuilder::kFloat64RoundTiesEven;
   }
   return flags;
 }
 
 }  // namespace compiler
 }  // namespace internal
 }  // namespace v8