[turbofan] Implemented the optional Float32RoundTiesEven operator.

src/compiler/instruction-selector.cc

Index: src/compiler/instruction-selector.cc
diff --git a/src/compiler/instruction-selector.cc b/src/compiler/instruction-selector.cc
index fa276668ae41399a2bf0a65460c6c6084b2eee45..c4af7e88f8d7e3f36381d4bc61a0e8ccb75c5c8e 100644
--- a/src/compiler/instruction-selector.cc
+++ b/src/compiler/instruction-selector.cc
@@ -937,6 +937,8 @@ void InstructionSelector::VisitNode(Node* node) {
       return MarkAsFloat64(node), VisitFloat64RoundTruncate(node);
     case IrOpcode::kFloat64RoundTiesAway:
       return MarkAsFloat64(node), VisitFloat64RoundTiesAway(node);
+    case IrOpcode::kFloat32RoundTiesEven:
+      return MarkAsFloat32(node), VisitFloat32RoundTiesEven(node);
     case IrOpcode::kFloat64RoundTiesEven:
       return MarkAsFloat64(node), VisitFloat64RoundTiesEven(node);
     case IrOpcode::kFloat64ExtractLowWord32: