Mark Johnston 3ead60236f Generalize bus_space(9) and atomic(9) sanitizer interceptors
Make it easy to define interceptors for new sanitizer runtimes, rather
than assuming KCSAN.  Lay a bit of groundwork for KASAN and KMSAN.

When a sanitizer is compiled in, atomic(9) and bus_space(9) definitions
in atomic_san.h are used by default instead of the inline
implementations in the platform's atomic.h.  These definitions are
implemented in the sanitizer runtime, which includes
machine/{atomic,bus}.h with SAN_RUNTIME defined to pull in the actual
implementations.

No functional change intended.

MFC after:	1 month
Sponsored by:	The FreeBSD Foundation
2021-03-22 22:21:53 -04:00
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