[turbofan] Introduce TruncateTaggedToWord32 simplified operator.

src/compiler/x87/instruction-selector-x87.cc

 // Copyright 2014 the V8 project authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "src/base/adapters.h"
 #include "src/compiler/instruction-selector-impl.h"
 #include "src/compiler/node-matchers.h"
 #include "src/compiler/node-properties.h"
 
 namespace v8 {
@@ skipping 826 matching lines @@
   X87OperandGenerator g(this);
   Emit(kX87Float64ToUint32, g.DefineAsRegister(node), g.Use(node->InputAt(0)));
 }
 
 void InstructionSelector::VisitTruncateFloat64ToFloat32(Node* node) {
   X87OperandGenerator g(this);
   Emit(kX87Float64ToFloat32, g.DefineAsFixed(node, stX_0),
        g.Use(node->InputAt(0)));
 }
 
-
-void InstructionSelector::VisitTruncateFloat64ToInt32(Node* node) {
+void InstructionSelector::VisitTruncateFloat64ToWord32(Node* node) {
   X87OperandGenerator g(this);
 
   switch (TruncationModeOf(node->op())) {
     case TruncationMode::kJavaScript:
       Emit(kArchTruncateDoubleToI, g.DefineAsRegister(node),
            g.Use(node->InputAt(0)));
       return;
     case TruncationMode::kRoundToZero:
       Emit(kX87Float64ToInt32, g.DefineAsRegister(node),
            g.Use(node->InputAt(0)));
@@ skipping 760 matching lines @@
            MachineOperatorBuilder::kFloat32RoundTruncate |
            MachineOperatorBuilder::kFloat64RoundTruncate |
            MachineOperatorBuilder::kFloat32RoundTiesEven |
            MachineOperatorBuilder::kFloat64RoundTiesEven;
   return flags;
 }
 
 }  // namespace compiler
 }  // namespace internal
 }  // namespace v8