John Baldwin 39585a4c10 Disable WITNESS for spin locks by default.
This matches all other architectures and removes substantial overhead.

Reported by:	arichardson (indirectly)
Reviewed by:	imp, arichardson
Obtained from:	CheriBSD
Sponsored by:	DARPA
Differential Revision:	https://reviews.freebsd.org/D26403
2020-09-11 00:06:16 +00:00
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