Map heap maps at a lower address.
Map heap maps at a lower address.

We now map the heap mmaps at a lower address in case the app needs
larger continuous address space.

Bug: 16502380

Change-Id: I2cc11d0c207c0eae8db0c5025a48b11119c5a802

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