[turbofan] Implemented the optional Float32RoundTiesEven operator.

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

Index: src/compiler/arm/instruction-selector-arm.cc
diff --git a/src/compiler/arm/instruction-selector-arm.cc b/src/compiler/arm/instruction-selector-arm.cc
index b0dce45df5bf09474718bfc42e8d791516ec6b88..777819a6dc38acadfe48f21528fd9c15ec7ad51d 100644
--- a/src/compiler/arm/instruction-selector-arm.cc
+++ b/src/compiler/arm/instruction-selector-arm.cc
@@ -1150,6 +1150,11 @@ void InstructionSelector::VisitFloat64RoundTiesAway(Node* node) {
 }
 
 
+void InstructionSelector::VisitFloat32RoundTiesEven(Node* node) {
+  VisitRR(this, kArmVrintnF32, node);
+}
+
+
 void InstructionSelector::VisitFloat64RoundTiesEven(Node* node) {
   VisitRR(this, kArmVrintnF64, node);
 }
@@ -1587,6 +1592,7 @@ InstructionSelector::SupportedMachineOperatorFlags() {
              MachineOperatorBuilder::kFloat32RoundTruncate |
              MachineOperatorBuilder::kFloat64RoundTruncate |
              MachineOperatorBuilder::kFloat64RoundTiesAway |
+             MachineOperatorBuilder::kFloat32RoundTiesEven |
              MachineOperatorBuilder::kFloat64RoundTiesEven;
   }
   return flags;