[Vm-dev] [OpenSmalltalk/opensmalltalk-vm] Reproduceable Segmentation fault while saving images (#444)

[Alistair Grant]

Just for the record:

```
Thread 1 "pharo" hit Breakpoint 5, scavengeReferentsOf (referrer=22055008)
    at /home/alistair/opensmalltalk-vm/opensmalltalk-vm/spur64src/vm/gcc3x-cointerp.c:42158
42158		assert((!(isForwarded(referrer)))
    0x7ffffffa7f80 I SessionManager>launchSnapshot:andQuit: 0x1508860: a(n) SessionManager
    0x7ffffffa7ff0 I [] in SessionManager>snapshot:andQuit: 0x1508860: a(n) SessionManager
    0x7ffffffa8030 I [] in BlockClosure>newProcess 0xef01d8: a(n) BlockClosure
(gdb) call printFrame(0x7ffffffa8030)
    0x7ffffffa8030 is on a free page?!
$2 = 0
```

The call frame being on a free page doesn't look good.

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