Add more logging when mmap fails.
Add more logging when mmap fails.

We now print the reason that the mmap failed.

Change-Id: Ie515e4bba117c9ea1f4297abb826d32172bea962

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