Merge changes Iba55937d,Ib5d82bde,Id0c921bd
am: d1be2a3483

* commit 'd1be2a34836fc32d938225c08eae722f50bbb175':
  Revert "Revert "Revert "Temporarily disable dex cache array emptyness DCHECK"""
  Revert "Revert "Hold dex caches live in class table""
  Revert "Hold dex caches live in class table"

Change-Id: Id0ee5d9e1723e2bdadfd40493649ced43b3d60cb