Add systrace regions for file opening during setup.
Add systrace regions for file opening during setup.

When the non-parallel dex2oat setup is slow this will help to explain the major
culprit.

Change-Id: I20143a8c7fafb3f7b834902d95dd85dbfe358746

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