Function unary

src/lower2/stackmaps.rs:1047–1056

(
    state: &mut FrameState,
    value: FrameValue,
    context: &str,
    instruction_index: usize,
)

    matches!(
        instruction,
        I::Ifeq(_)
            | I::Ifne(_)
            | I::Iflt(_)
            | I::Ifge(_)
            | I::Ifgt(_)
            | I::Ifle(_)
            | I::If_icmpeq(_)
            | I::If_icmpne(_)
            | I::If_icmplt(_)
            | I::If_icmpge(_)
            | I::If_icmpgt(_)
            | I::If_icmple(_)
            | I::If_acmpeq(_)