Dump oat file statistics with PrettySize.
Dump oat file statistics with PrettySize.

Also, only dump in debug builds to be consistent with other compiler stats.

Change-Id: I98650e918b6451f55ae8e261adfe0852e140c5e0

treadstoneproject/artinst,treadstoneproject/artinst,treadstoneproject/artinst,treadstoneproject/artinst,treadstoneproject/artinst