This is analagous to `Vec::push_mut()`, which was stabilied in Rust
1.95.0. Since we can't use that rust version yet, we internally
implement it as `push()` followed by `last_mut().unwrap()`.
Reviewed-by: Mel Henning <mhenning@darkrefraction.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/41941>
Rename it to SmallVec, make it more generic and switch NAK
to it.
Signed-off-by: Christian Gmeiner <cgmeiner@igalia.com>
Reviewed-by: Faith Ekstrand <faith.ekstrand@collabora.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/31409>