Method subsume

cranelift/codegen/src/opts.rs:288–293

(&mut self, value: Value)

    }

    fn subsume(&mut self, value: Value) -> Value {
        trace!("subsume: {}", value);
        self.ctx.subsume_values.insert(value);
        self.ctx.stats.subsume += 1;
        value
    }

    fn splat64(&mut self, val: u64) -> Constant {
        let val = u128::from(val);