[turbofan] Introduce TruncateTaggedToWord32 simplified operator.

src/compiler/s390/instruction-selector-s390.cc

Index: src/compiler/s390/instruction-selector-s390.cc
diff --git a/src/compiler/s390/instruction-selector-s390.cc b/src/compiler/s390/instruction-selector-s390.cc
index e96b7e76c5bf542bd2483530c0396f5a3b93c45f..78b352bc11b3ae77224ee941eedd80b0be9a99fd 100644
--- a/src/compiler/s390/instruction-selector-s390.cc
+++ b/src/compiler/s390/instruction-selector-s390.cc
@@ -1042,7 +1042,7 @@ void InstructionSelector::VisitTruncateFloat64ToFloat32(Node* node) {
   VisitRR(this, kS390_DoubleToFloat32, node);
 }
 
-void InstructionSelector::VisitTruncateFloat64ToInt32(Node* node) {
+void InstructionSelector::VisitTruncateFloat64ToWord32(Node* node) {
   switch (TruncationModeOf(node->op())) {
     case TruncationMode::kJavaScript:
       return VisitRR(this, kArchTruncateDoubleToI, node);