Macro cipher::iv_state_test

macro_rules! iv_state_test {
    ($name:ident, $cipher:ty, encrypt $(,)?) => { ... };
    ($name:ident, $cipher:ty, decrypt $(,)?) => { ... };
    ($name:ident, $cipher:ty, apply_ks $(,)?) => { ... };
    ($name:ident, $cipher:ty, $method:ident $(,)?) => { ... };
}

This is supported on crate feature dev only.

Define IvState test