message: Fix Value::new_repr signature
diff: @@ -80,7 +80,7 @@ impl<'v> Value<'v> {
  Self(Pointer::new_unfrozen(x))
  }
  - pub(crate) fn new_repr<'a, T: 'a>(x: &'static AValueRepr<T>) -> Self {
  + pub(crate) fn new_repr<T: 'v>(x: &'v AValueRepr<T>) -> Self {
  Self::new_ptr(&x.header)
  }
  