HHVM 3.18 produces /tmp/perf-XXXXX.map files although settings

### HHVM Version
HHVM 3.18 (ulyaoth-hhvm-lts-3.18-3.18.1-1.el7.x86_64 on RHEL7)
### Standalone code, or other way to reproduce the problem
Run HHVM with
/etc/hhvm/server.ini:hhvm.keep_perf_pid_map = 0
/etc/hhvm/server.ini:hhvm.perf_pid_map = 0
/etc/hhvm/server.ini:hhvm.perf_data_map = 0
### Expected result
no /tmp/perf-XXXXX.map
### Actual result
HHVM produces /tmp/perf-XXXX.map files

Thank you,
Vitaly