[Vm-dev] [OpenSmalltalk/opensmalltalk-vm] Reproducible segfault with Squeak (Issue #601)

[Marcel Taeumel]

Smalltalk stack looks okay; at least there are no strange repetitions that might head into an overflow-ish out-of-memory situation.

Here are some interesting stack frames:
```
  0x7ffd3b660328 M ClassForTestToBeDeleted91>fuelAccept: 0x2ca5c28: a(n) ClassForTestToBeDeleted91
  ...
  0x7ffd3b681f20 M FLCurrentContext class(DynamicVariable class)>value:during: 0x6a1ec98: a(n) FLCurrentContext class
  ...
  0x7ffd3b682280 I FLHookedSubstitutionTest>testClassWithCachedValueByNil 0x6f359e8: a(n) FLHookedSubstitutionTest
  ...
```

Here are some wild guesses:
- Maybe some issues in the area of class creation/deletion?
- Maybe some issues with our recent changes to process termination and #ensure: blocks? ("Most recent primitives" shows #findNextHandlerContextStarting, #findNextUnwindContextUpTo:)


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