TurboFan: Introduce TaggedSigned and TaggedPointer representations.

src/machine-type.cc

Index: src/machine-type.cc
diff --git a/src/machine-type.cc b/src/machine-type.cc
index 7c4ddd3967f88cdc9bc6ee2488bca743318f6383..9289673bd7a0c1ae446937bfd3a307f78ff0990a 100644
--- a/src/machine-type.cc
+++ b/src/machine-type.cc
@@ -32,6 +32,10 @@ const char* MachineReprToString(MachineRepresentation rep) {
       return "kRepFloat64";
     case MachineRepresentation::kSimd128:
       return "kRepSimd128";
+    case MachineRepresentation::kTaggedSigned:
+      return "kRepTaggedSigned";
+    case MachineRepresentation::kTaggedPointer:
+      return "kRepTaggedPointer";
     case MachineRepresentation::kTagged:
       return "kRepTagged";
   }