[Bug sanitizer/82824] [8 regression] libsanitizer fails to build: VM_MEMORY_OS_ALLOC_ONCE undefined

[dominiq at lps dot ens.fr]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=82824

--- Comment #15 from Dominique d'Humieres <dominiq at lps dot ens.fr> ---
> That's the value of VM_MEMORY_OS_ALLOC_ONCE on Mac OS X 10.9 and up.

Thanks!