Check that all properties are processed in NameDictionary::CopyEnumKeysTo.

BUG=372579
LOG=N
R=verwaest@chromium.org

Review URL: https://codereview.chromium.org/306663002

git-svn-id: https://v8.googlecode.com/svn/branches/bleeding_edge@21571 ce2b1a6d-e550-0410-aec6-3dcde31c8c00

src/objects.cc

@@ -16100,6 +16100,7 @@ void NameDictionary::CopyEnumKeysTo(FixedArray* storage) {
        if (properties == length) break;
      }
   }
+  CHECK_EQ(length, properties);
   EnumIndexComparator cmp(this);
   Smi** start = reinterpret_cast<Smi**>(storage->GetFirstElementAddress());
   std::sort(start, start + length, cmp);