Map and Descriptor printing enhanced a bit.

Review URL: https://codereview.chromium.org/801783002

Cr-Commit-Position: refs/heads/master@{#25797}

src/objects-printer.cc

@@ -408,6 +408,7 @@ void Map::MapPrint(std::ostream& os) {  // NOLINT
   os << "\n - pre-allocated property fields: "
      << pre_allocated_property_fields() << "\n";
   os << " - unused property fields: " << unused_property_fields() << "\n";
+  if (is_deprecated()) os << " - deprecated_map\n";
   if (is_dictionary_map()) os << " - dictionary_map\n";
   if (is_prototype_map()) os << " - prototype_map\n";
   if (is_hidden_prototype()) os << " - hidden_prototype\n";

src/property.cc

@@ -62,7 +62,7 @@ std::ostream& operator<<(std::ostream& os, const PropertyDetails& details) {
       UNREACHABLE();
       break;
   }
-  return os << "dictionary_index: " << details.dictionary_index()
+  return os << " dictionary_index: " << details.dictionary_index()
             << ", attrs: " << details.attributes() << ")";
 }
 
@@ -103,9 +103,15 @@ void PropertyDetails::Print(bool dictionary_mode) {
 
 
 std::ostream& operator<<(std::ostream& os, const Descriptor& d) {
-  return os << "Descriptor " << Brief(*d.GetKey()) << " @ "
-            << Brief(*d.GetValue()) << " "
-            << FastPropertyDetails(d.GetDetails());
+  Object* value = *d.GetValue();
+  os << "Descriptor " << Brief(*d.GetKey()) << " @ " << Brief(value) << " ";
+  if (value->IsAccessorPair()) {
+    AccessorPair* pair = AccessorPair::cast(value);
+    os << "(get: " << Brief(pair->getter())
+       << ", set: " << Brief(pair->setter()) << ") ";
+  }
+  os << FastPropertyDetails(d.GetDetails());
+  return os;
 }
 
 } }  // namespace v8::internal