Todays alloc() accepts migrate-fn, size and alignment. All the callers
don't really need to provide anything special for the migrate-fn and
are just happy with default alignof() for alignment. The simplification
is in providing alloc() that only accepts size arg and does the rest
itself.
Signed-off-by: Pavel Emelyanov <xemul@scylladb.com>
28f01aadc9