TurboFan: Introduce TaggedSigned and TaggedPointer representations.

src/compiler/representation-change.cc

Index: src/compiler/representation-change.cc
diff --git a/src/compiler/representation-change.cc b/src/compiler/representation-change.cc
index 4032df2d92d23b9c5f3cbcd8b0b3645fb9dab36e..448fe3f8b1ba4a6386dc2b570006e56f344ad008 100644
--- a/src/compiler/representation-change.cc
+++ b/src/compiler/representation-change.cc
@@ -141,6 +141,8 @@ Node* RepresentationChanger::GetRepresentationFor(
   }
 
   switch (use_info.representation()) {
+    case MachineRepresentation::kTaggedSigned:
+    case MachineRepresentation::kTaggedPointer:
     case MachineRepresentation::kTagged:
       DCHECK(use_info.type_check() == TypeCheckKind::kNone);
       return GetTaggedRepresentationFor(node, output_rep, output_type);