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

[Juraj Kubelka]

Executing the following script produces a segmentation fault:

```Smalltalk
| aJson anArray |
aJson := ZnEasy get: 'https://data.nasa.gov/resource/y77d-th95.json' asZnUrl.
Array streamContents: [ :aStream |
	400 timesRepeat: [ 
		aStream nextPutAll: (STON fromString: aJson contents).
		Smalltalk saveSession ] ].
```

[crash.dmp.txt](https://github.com/OpenSmalltalk/opensmalltalk-vm/files/3843413/crash.dmp.txt)

Reproduced on Pharo 8 Mac OS:

```
Image
-----
Pharo8.0.0
Build information: Pharo-8.0.0+build.972.sha.bbb812d1387fd27ef4096e35224cb4425a60ab6c (64 Bit)
Unnamed

Virtual Machine
---------------
/Users/.../Pharo/vms/80-x64/Pharo.app/Contents/MacOS/Pharo
CoInterpreter VMMaker.oscog-eem.2504 uuid: a00b0fad-c04c-47a6-8a11-5dbff110ac11 Jan  5 2019
StackToRegisterMappingCogit VMMaker.oscog-eem.2504 uuid: a00b0fad-c04c-47a6-8a11-5dbff110ac11 Jan  5 2019
VM: 201901051900 https://github.com/OpenSmalltalk/opensmalltalk-vm.git Date: Sat Jan 5 20:00:11 2019 CommitHash: 7a3c6b6 Plugins: 201901051900 https://github.com/OpenSmalltalk/opensmalltalk-vm.git

Mac OS X built on Jan  5 2019 19:11:02 UTC Compiler: 4.2.1 Compatible Apple LLVM 7.3.0 (clang-703.0.31)
VMMaker versionString VM: 201901051900 https://github.com/OpenSmalltalk/opensmalltalk-vm.git Date: Sat Jan 5 20:00:11 2019 CommitHash: 7a3c6b6 Plugins: 201901051900 https://github.com/OpenSmalltalk/opensmalltalk-vm.git
CoInterpreter VMMaker.oscog-eem.2504 uuid: a00b0fad-c04c-47a6-8a11-5dbff110ac11 Jan  5 2019
StackToRegisterMappingCogit VMMaker.oscog-eem.2504 uuid: a00b0fad-c04c-47a6-8a11-5dbff110ac11 Jan  5 2019
```

Also reproduced on Pharo 8 Mac OS:
```
Virtual Machine
---------------
/Users/syrel/Documents/Pharo/images/GToolkit/../../vms/80-x64/Pharo.app/Contents/MacOS/Pharo
CoInterpreter VMMaker.oscog-eem.2570 uuid: b61e294a-cb2a-4d9a-9e7e-8cc17676c920 Oct 16 2019
StackToRegisterMappingCogit VMMaker.oscog-eem.2570 uuid: b61e294a-cb2a-4d9a-9e7e-8cc17676c920 Oct 16 2019
VM: 201910161212 https://github.com/OpenSmalltalk/opensmalltalk-vm.git Date: Wed Oct 16 14:12:15 2019 CommitHash: da97dd5 Plugins: 201910161212 https://github.com/OpenSmalltalk/opensmalltalk-vm.git
Mac OS X built on Oct 16 2019 12:39:27 GMT Compiler: 4.2.1 Compatible Apple LLVM 8.1.0 (clang-802.0.42)
```

Also reproduced on Pharo 8 Linux Ubuntu 18.04: 
```
Pharo VM version: 5.0-201902062351  Wed Feb  6 23:59:26 UTC 2019 gcc 4.8 [Production Spur 64-bit VM]
Built from: CoInterpreter VMMaker.oscog-eem.2509 uuid: 91e81f64-95de-4914-a960-8f842be3a194 Feb  6 2019
With: StackToRegisterMappingCogit VMMaker.oscog-eem.2509 uuid: 91e81f64-95de-4914-a960-8f842be3a194 Feb  6 2019
Revision: VM: 201902062351 https://github.com/OpenSmalltalk/opensmalltalk-vm.git Date: Wed Feb 6 15:51:18 2019 CommitHash: a838346b Plugins: 201902062351 https://github.com/OpenSmalltalk/opensmalltalk-vm.git
Build host: Linux travis-job-f2b22483-7f84-414f-b833-69f69518c685 4.4.0-101-generic #124~14.04.1-Ubuntu SMP Fri Nov 10 19:05:36 UTC 2017 x86_64 x86_64 x86_64 GNU/Linux
plugin path: /dev/shm/p8/pharo-vm/lib/pharo/5.0-201902062351 [default: /dev/shm/p8/pharo-vm/lib/pharo/5.0-201902062351/]
```



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