emaste 384cc05095 add retpoline compiler and linker feature flags
These features indicate that the compiler and linker support the
retpoline speculative execution vulnerability (CVE-2017-5715)
mitigation.

Reviewed by:	dim, imp
Sponsored by:	The FreeBSD Foundation
Differential Revision:	https://reviews.freebsd.org/D14228
2018-02-07 14:50:06 +00:00
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