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2021-12-22T10:13:12.896038Z
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clang: allow -fstack-clash-protection on FreeBSD

-fstack-clash-protection was added in Clang commit e67cbac81211 but was
enabled only on Linux.  It should work fine on FreeBSD as well, so
enable it.

To be discussed and upstreamed with a test.  The OS test should probably
just be removed.

Reviewed by:	dim
MFC after:	1 week
Sponsored by:	The FreeBSD Foundation
Differential Revision:	https://reviews.freebsd.org/D27366

(cherry picked from commit 3063e1e56b509373d143a3a4c67d388bd390f268)

Git Hash:   c37c3d580eb36c1b9dfb608412904b30c997aab3
Git Author: emaste@FreeBSD.org
END