[turbofan] Add the RoundInt32ToFloat32 operator to turbofan.

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 86868e59eee5292ef7ec821f98eb4d5b3575396f..c3ee9ff8a81ba2951f7851b82f64192c9e4d7d42 100644
--- a/src/compiler/instruction-selector.cc
+++ b/src/compiler/instruction-selector.cc
@@ -976,6 +976,8 @@ void InstructionSelector::VisitNode(Node* node) {
       return MarkAsWord32(node), VisitTruncateInt64ToInt32(node);
     case IrOpcode::kRoundInt64ToFloat32:
       return MarkAsFloat32(node), VisitRoundInt64ToFloat32(node);
+    case IrOpcode::kRoundInt32ToFloat32:
+      return MarkAsFloat32(node), VisitRoundInt32ToFloat32(node);
     case IrOpcode::kRoundInt64ToFloat64:
       return MarkAsFloat64(node), VisitRoundInt64ToFloat64(node);
     case IrOpcode::kBitcastFloat32ToInt32: