[OpenSmalltalk/opensmalltalk-vm] isReadOnlyObject should return false when writebarrier is not supported (#217)

 

Object is definitely not readonly when VM do not support write barrier. But right now it will be primitive failure.

For example it makes impossible to modify classes in Pharo 7 on ARM VM.
Pharo 7 checks instances for readonly before migrating them

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Probably it is image side logic.
So close if it is not related to VM

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It's image-side logic IMO

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Closed #217.

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