Revert "Enable JIT dual data mapping."

This reverts commit b3b803b69d5db392ea7cf7a1fea443d4ba133134.

Reason for revert: Another random idea for diagnosing timeouts.
This CL was submitted around the right time and touches mmaps.

Bug: 142039427
Test: device boots
Test: test.py --host -b -r --jit --64
Change-Id: If8e3fb5e9bd5b4389f807f8ce07e4b9d8f263009
1 file changed