pub const BrCond = struct {
    cond: Value,
    then: Block.Index,
    @"else": Block.Index,
    weights: Weights,
    pub const Weights = enum(u32) {
        // We can do this as metadata indices 0 and 1 are reserved.
        none = 0,
        unpredictable = 1,
        /// These values should be converted to `Metadata` to be used
        /// in a `prof` annotation providing branch weights.
        _,
    };
}