[CRIU] Restore failed if a process is dumped/restored in a loop

[Andrey Vagin]

The problem is due to MAP_GROWSDOWN again.

The log from strace:
7313  mmap(0x25000, 147456, PROT_READ|PROT_WRITE|PROT_EXEC,
MAP_PRIVATE|MAP_FIXED|MAP_ANONYMOUS|MAP_GROWSDOWN, -1, 0) = 0x25000

cat /proc/7313/maps
00026000-00049000 rwxp 00000000 00:00 0