[Turbofan]: Use new MachineTypes in access-builder.

src/compiler/instruction.h

Index: src/compiler/instruction.h
diff --git a/src/compiler/instruction.h b/src/compiler/instruction.h
index 74efd86fbecef0510076425900b4a1d6743003ac..3accb28d45ac22bf718f33ef004418983d578dcf 100644
--- a/src/compiler/instruction.h
+++ b/src/compiler/instruction.h
@@ -1341,7 +1341,9 @@ class InstructionSequence final : public ZoneObject {
 
   bool IsReference(int virtual_register) const {
     return GetRepresentation(virtual_register) ==
-           MachineRepresentation::kTagged;
+               MachineRepresentation::kTagged ||
+           GetRepresentation(virtual_register) ==
+               MachineRepresentation::kTaggedPointer;
   }
   bool IsFP(int virtual_register) const {
     return IsFloatingPoint(GetRepresentation(virtual_register));