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

(cherry picked from commit 18bacb60e09fa8aa20ae0a1d7a4a8968d4913fb0)

Change-Id: I66447f853e439448c72923e2d1c657c94c5f1543
1 file changed