Merge "Mark kQuickReadBarrierForRootSlow as direct entry point on MIPS." am: 72cc929186 am: 95d1c7b823
am: 65e19e1e8c

* commit '65e19e1e8cbabb5095c11a69088dd85d3e5d0460':
  Mark kQuickReadBarrierForRootSlow as direct entry point on MIPS.