[turbofan] Add the CheckedTruncateTaggedToWord32 opcode.

src/compiler/representation-change.cc

 // Copyright 2015 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/compiler/representation-change.h"
 
 #include <sstream>
 
 #include "src/base/bits.h"
 #include "src/code-factory.h"
@@ skipping 440 matching lines @@
     }
   } else if (output_rep == MachineRepresentation::kTagged) {
     if (output_type->Is(Type::TaggedSigned())) {
       op = simplified()->ChangeTaggedSignedToInt32();
     } else if (output_type->Is(Type::Unsigned32())) {
       op = simplified()->ChangeTaggedToUint32();
     } else if (output_type->Is(Type::Signed32())) {
       op = simplified()->ChangeTaggedToInt32();
     } else if (use_info.truncation().IsUsedAsWord32()) {
       if (use_info.type_check() == TypeCheckKind::kNumberOrOddball) {
-        op = simplified()->CheckedTaggedToFloat64();
-        Node* effect = NodeProperties::GetEffectInput(use_node);
-        Node* control = NodeProperties::GetControlInput(use_node);
-        Node* to_float_checked =
-            jsgraph()->graph()->NewNode(op, node, effect, control);
-        NodeProperties::ReplaceEffectInput(use_node, to_float_checked);
-        return jsgraph()->graph()->NewNode(machine()->TruncateFloat64ToWord32(),
-                                           to_float_checked);
+        op = simplified()->CheckedTruncateTaggedToWord32();
+      } else {
+        op = simplified()->TruncateTaggedToWord32();
       }
-      op = simplified()->TruncateTaggedToWord32();
     } else if (use_info.type_check() == TypeCheckKind::kSigned32) {
       op = simplified()->CheckedTaggedToInt32();
     }
   } else if (output_rep == MachineRepresentation::kWord32) {
     // Only the checked case should get here, the non-checked case is
     // handled in GetRepresentationFor.
     if (use_info.type_check() == TypeCheckKind::kSigned32) {
       if (output_type->Is(Type::Signed32())) {
         return node;
       } else if (output_type->Is(Type::Unsigned32())) {
@@ skipping 309 matching lines @@
 }
 
 Node* RepresentationChanger::InsertChangeTaggedToFloat64(Node* node) {
   return jsgraph()->graph()->NewNode(simplified()->ChangeTaggedToFloat64(),
                                      node);
 }
 
 }  // namespace compiler
 }  // namespace internal
 }  // namespace v8