On Apple Silicon, Rosetta's shared cache starts at 0x7ffe00000000 and
the runtime is mapped below that.
Put the top-down allocation area below the runtime with plenty of room
to spare.
Signed-off-by: Brendan Shanks <bshanks@codeweavers.com>
Signed-off-by: Alexandre Julliard <julliard@winehq.org>