Fix deadlock in lazy intialization of CoreBTypes#19297

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WojciechMazur wants to merge 2 commits intoscala:mainfrom

WojciechMazur:fix/parallel-backend-deadlock

Commits on Dec 19, 2023

Prevent usage of double synchronization for intialization of lazy vals in CoreBTypes
WojciechMazur
committed
Restore parallel backend tests
WojciechMazur
committed