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

src/compiler/representation-change.h

Index: src/compiler/representation-change.h
diff --git a/src/compiler/representation-change.h b/src/compiler/representation-change.h
index 7d2a23c9278e538b115c0823df2fffcbc49fb96a..9f50d2aa60b83c797c011763f7d206e9c76a9800 100644
--- a/src/compiler/representation-change.h
+++ b/src/compiler/representation-change.h
@@ -139,6 +139,12 @@ class UseInfo {
   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() {