machine/asan.h, which contains the MD functions. We use an include rather
than a plain C file, because we want GCC to optimize/inline some functions
into one single block.
The amd64 MD parts of KASAN are moved accordingly.
The naming convention we use is:
kasan_*
a generic kasan object, declared in subr_asan.c
kasan_md_*
an MD kasan object, declared in machine/asan.h, and used
in subr_asan.c
__md_*
an MD object, declared in machine/asan.h, and not used
outside
Overall this makes it easier to add KASAN support on more architectures.
Discussed with several people.
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