arch/tile: provide a definition of MAP_STACK
It's convenient for userspace (in particular, glibc) to find a
definition of MAP_STACK. We use MAP_GROWSDOWN as an alias since
that's appropriate for the main stack, and since our current
allocation of mmap flags bits is running a bit short otherwise.
Signed-off-by: NChris Metcalf <cmetcalf@tilera.com>
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