message: Rename SkipIf to SkipIfNot
diff: @@ -506,7 +506,7 @@ pub enum PolishToken<F> {
  Store,
  Load(usize),
  /// Skip the given number of tokens if the feature is disabled, and emit a zero instead.
  - SkipIf(FeatureFlag, usize),
  + SkipIfNot(FeatureFlag, usize),
  }
  impl Variable {
  @@ -602,7 +602,7 @@ impl<F: FftField> PolishToken<F> {
  cache.push(x);
  }
  Load(i) => stack.push(cache[*i]),
  - SkipIf(feature, count) => {
  + SkipIfNot(feature, count) => {
  if !feature.is_enabled() {
  skip_count = *count;
  stack.push(F::zero());
  @@ -1297,7 +1297,7 @@ impl<F: FftField> Expr<ConstantExpr<F>> {
  }
  }
  Expr::EnabledIf(feature, e) => {
  - let tok = PolishToken::SkipIf(*feature, 0);
  + let tok = PolishToken::SkipIfNot(*feature, 0);
  res.push(tok);
  let len_before = res.len();
  /* Clone the cache, to make sure we don't try to access cached statements later
  @@ -1305,7 +1305,7 @@ impl<F: FftField> Expr<ConstantExpr<F>> {
  let mut cache = cache.clone();
  e.to_polish_(&mut cache, res);
  let len_after = res.len();
  - res[len_before - 1] = PolishToken::SkipIf(*feature, len_after - len_before);
  + res[len_before - 1] = PolishToken::SkipIfNot(*feature, len_after - len_before);
  }
  }
  }
  