[fpc-pascal] GDeque unit crash, FPC trunk

[AlexeyT]

For those who wants to replicated gdeque crash. I avoided using of 
gdeque unit now, so to replicate, pls get an older version of 
atsynedit_adapter_cache.pas: before 2019.01.30

https://github.com/Alexey-T/ATSynEdit/commits/master/atsynedit/atsynedit_adapter_cache.pas

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Regards,
Alexey