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Put extension/parallel buck files back (#9232)

I shouldn't have deleted these, for the same reason I left
thread_parallel.h behind.
S
Scott Wolchok committed
2407647e729aad43f45d29bfc3c85751bbdc2de7
Parent: 54c3f78
Committed by GitHub <noreply@github.com> on 3/13/2025, 9:11:04 PM