[Vm-dev] [OpenSmalltalk/opensmalltalk-vm] ThreadedFFIPlugin can access stale objects after a callout. (#516)

[Eliot Miranda]

In structure return the FFIPlugin creates an instance of the return type (retType in ffiReturnStruct:ofType:in:), but the return type has been fetched from the stack or method *before* the callout, not after.  This should be fixed, but it needs thought to determine the best way to access the type object.

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https://github.com/OpenSmalltalk/opensmalltalk-vm/issues/516
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