linux: implement set_upcall on aarch64
This fixes "git diff" (git-1:2.25.1-1ubuntu3).
Sponsored By: EPSRC
Differential Revision: https://reviews.freebsd.org/D30509
(cherry picked from commit e505c3066bbdb96dd28ff4634a315346490b9b33)
linux: implement set_upcall on aarch64 Tags None Referenced Files None Subscribers None
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