message: add chacha constraint range
diff: @@ -9,6 +9,7 @@ pub const ENDML: Range<usize> = 24..35;
  // pub const PACK : Range<usize> = 19..24; // todo
  pub const MUL: Range<usize> = 35..58;
  // pub const MLPCK : Range<usize> = 29..34;
  +pub const CHACHA: Range<usize> = 58..(58+9);
  /// Computes the powers of alpha, starting with alpha^2
  // TODO(mimoo): because of the way we do things, we never use alpha itself. This should instead return 1, alpha, alpha^2, etc. or better, an iterator
  