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Summary: The initialization of RegisterBank needs to be done only once. The logic of AlreadyInit has data race, use llvm::call_once instead. This is continuing work of D73587. Reviewers: arsenm, rovka, dsanders, t.p.northover, efriedma, apazos Reviewed By: arsenm Subscribers: wdng, kristof.beyls, hiraditya, llvm-commits Tags: #llvm Differential Revision: https://reviews.llvm.org/D73605
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