[turbofan] Base more write barrier decisions on machine representation.

src/compiler/representation-change.h

 // 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.
 
 #ifndef V8_COMPILER_REPRESENTATION_CHANGE_H_
 #define V8_COMPILER_REPRESENTATION_CHANGE_H_
 
 #include "src/compiler/js-graph.h"
 #include "src/compiler/simplified-operator.h"
 
@@ skipping 121 matching lines @@
   }
   static UseInfo TruncatingFloat64() {
     return UseInfo(MachineRepresentation::kFloat64, Truncation::Float64());
   }
   static UseInfo PointerInt() {
     return kPointerSize == 4 ? TruncatingWord32() : TruncatingWord64();
   }
   static UseInfo AnyTagged() {
     return UseInfo(MachineRepresentation::kTagged, Truncation::Any());
   }
+  static UseInfo TaggedSigned() {
+    return UseInfo(MachineRepresentation::kTaggedSigned, Truncation::Any());
+  }
+  static UseInfo TaggedPointer() {
+    return UseInfo(MachineRepresentation::kTaggedPointer, Truncation::Any());
+  }
 
   // Possibly deoptimizing conversions.
   static UseInfo CheckedSignedSmallAsWord32() {
     return UseInfo(MachineRepresentation::kWord32, Truncation::Any(),
                    TypeCheckKind::kSignedSmall);
   }
   static UseInfo CheckedSigned32AsWord32() {
     return UseInfo(MachineRepresentation::kWord32, Truncation::Any(),
                    TypeCheckKind::kSigned32);
   }
@@ skipping 118 matching lines @@
   Factory* factory() const { return isolate()->factory(); }
   SimplifiedOperatorBuilder* simplified() { return jsgraph()->simplified(); }
   MachineOperatorBuilder* machine() { return jsgraph()->machine(); }
 };
 
 }  // namespace compiler
 }  // namespace internal
 }  // namespace v8
 
 #endif  // V8_COMPILER_REPRESENTATION_CHANGE_H_