memory: default no-op allocator implementation.
memory: default no-op allocator implementation.

Signed-off-by: Elazar Leibovich <f66bf065cb40f105b126445a801a635b6b1cbf14@gmail.com>

cloudius-systems/seastar,avikivity/seastar,scylladb/seastar,syuu1228/seastar,scylladb/seastar,avikivity/seastar,dreamsxin/seastar,syuu1228/seastar,avikivity/seastar,syuu1228/seastar,dreamsxin/seastar,dreamsxin/seastar,scylladb/seastar,cloudius-systems/seastar,cloudius-systems/seastar