Don't add meta objects to the pool

We don't really support unloading classes, so don't add things like
Class objects or Properties to the pool.

Change-Id: Icd71081a489308f7a49e409eaad8db87d59ab6b6
After the pool is drained, invalidate yourself

Change-Id: I31c0a6f93c2af0e582aa0b2c3ff8fc5d1eade15a
Report what happens when memory debugging is turned on

Change-Id: Ia186f43a997976ee5329f4d72cee06ef0c34503c