Signed-off-by: Zheng, Qi <huaiqing.zq@antgroup.com>
ASLR is only enabled on release mode. Also manage the whole process VM with VMManager.
Rlimit are now on the same page of memory space limits defined in Occlum.json. Specific memory size configuration can be set to child process with `prlimit` syscall or using `ulimit` command in shell script.