Merge "Assembly region TLAB allocation fast path for arm64." am: ec9a828 am: 227eeb9
am: 9ddad6a

* commit '9ddad6a7a28af3bbc42ba6f7fb8bacb6e4e8dab0':
  Assembly region TLAB allocation fast path for arm64.

Change-Id: I91391b369d8af9ab5cd9680fbb911b20dccfa163