[turbofan] Introduce TruncateTaggedToWord32 simplified 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 36b628d62ae0a572d017c660e420db094e823599..4b0f62ae7bb09e25ee34b22de9c78da78177d4d1 100644
--- a/src/compiler/instruction-selector.cc
+++ b/src/compiler/instruction-selector.cc
@@ -1045,10 +1045,12 @@ void InstructionSelector::VisitNode(Node* node) {
       return MarkAsWord64(node), VisitChangeUint32ToUint64(node);
     case IrOpcode::kTruncateFloat64ToFloat32:
       return MarkAsFloat32(node), VisitTruncateFloat64ToFloat32(node);
-    case IrOpcode::kTruncateFloat64ToInt32:
-      return MarkAsWord32(node), VisitTruncateFloat64ToInt32(node);
+    case IrOpcode::kTruncateFloat64ToWord32:
+      return MarkAsWord32(node), VisitTruncateFloat64ToWord32(node);
     case IrOpcode::kTruncateInt64ToInt32:
       return MarkAsWord32(node), VisitTruncateInt64ToInt32(node);
+    case IrOpcode::kRoundFloat64ToInt32:
+      return MarkAsWord32(node), VisitRoundFloat64ToInt32(node);
     case IrOpcode::kRoundInt64ToFloat32:
       return MarkAsFloat32(node), VisitRoundInt64ToFloat32(node);
     case IrOpcode::kRoundInt32ToFloat32: