Enable cyclic region allocation in ART's region space only in debug mode.

Cyclic region allocation can create memory fragmentation at the
region level. Don't use it in non-debug (release) mode.

Test: art/test.py
Test: art/test/testrunner/testrunner.py -t 080-oom-fragmentation
Bug: 33795328
Bug: 74064045
Change-Id: I4619923a86018a17888798bdf247c6d616d5b248
1 file changed