[turbofan] Add the RoundInt32ToFloat32 operator to turbofan.

src/compiler/raw-machine-assembler.h

Index: src/compiler/raw-machine-assembler.h
diff --git a/src/compiler/raw-machine-assembler.h b/src/compiler/raw-machine-assembler.h
index 5c232ed1d124f3f600aac12259bec0fbb129376c..41ae1ba0bb0aeb597d1d6d2c62cec03a3d171afa 100644
--- a/src/compiler/raw-machine-assembler.h
+++ b/src/compiler/raw-machine-assembler.h
@@ -479,6 +479,9 @@ class RawMachineAssembler {
   Node* TruncateInt64ToInt32(Node* a) {
     return AddNode(machine()->TruncateInt64ToInt32(), a);
   }
+  Node* RoundInt32ToFloat32(Node* a) {
+    return AddNode(machine()->RoundInt32ToFloat32(), a);
+  }
   Node* RoundInt64ToFloat32(Node* a) {
     return AddNode(machine()->RoundInt64ToFloat32(), a);
   }