Revert^2 "ART: Dual mapping of JIT code pages""

Avoid setting footprint on code heap mspace when the heap size is zero.

Bug: 66095511
Bug: 111199492
Test: art/test.py --host --64 --interpreter --no-image -r -t 595-profile-saving

Change-Id: I8c475e135f7558915f799d3cb451595833e832a6
5 files changed