Switch art over to a long in DexFile.
Switch art over to a long in DexFile.

Change-Id: I4ced147941f0d564eaf7f314bc21f6fd9caf3cbb

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