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arm64: clear debug register state on fork

Description

arm64: clear debug register state on fork

Following the analogous change for amd64 and i386 in 8223717ce62c,
ensure that new processes start with these registers inactive.

PR: 254661
Reported by: Michał Górny
Reviewed by: kib, emaste
Sponsored by: The FreeBSD Foundation

(cherry picked from commit 1fd001db9c330f133708f3c04c8852f8b07cfed9)

Details

Provenance
mhorneAuthored on Apr 7 2021, 7:23 PM
Parents
R10:02816ecfb935: Partially revert r248770.
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