https://github.com/vitalybuka created 
https://github.com/llvm/llvm-project/pull/195670

Currently, `poison_history_size` only reports the poisoning stack trace
if the shadow value is exactly `kAsanUserPoisonedMemoryMagic`.

Unlike heap or stack poisoning, where red-zones
guaranteed, user poisoning more likely end-up with
single standalong granule. Printing history could be helpful.



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