Introduce instance type for transition arrays.

src/objects.cc

Index: src/objects.cc
diff --git a/src/objects.cc b/src/objects.cc
index d60bf8b56aa95cadb824b13ffc4ce02aa6c72921..d6bbb2644e0f89b657dac3567300411449be9647 100644
--- a/src/objects.cc
+++ b/src/objects.cc
@@ -1947,6 +1947,10 @@ void HeapObject::HeapObjectShortPrint(std::ostream& os) {  // NOLINT
     case BYTECODE_ARRAY_TYPE:
       os << "<BytecodeArray[" << BytecodeArray::cast(this)->length() << "]>";
       break;
+    case TRANSITION_ARRAY_TYPE:
+      os << "<TransitionArray[" << TransitionArray::cast(this)->length()
+         << "]>";
+      break;
     case FREE_SPACE_TYPE:
       os << "<FreeSpace[" << FreeSpace::cast(this)->size() << "]>";
       break;