message: [Storage][JellyfishMerkle] Use Self when possible
  Closes:
  Approved by: lightmark
diff: @@ -370,7 +370,7 @@ impl InternalNode {
  ) -> HashValue {
  // Given a bit [start, 1 << nibble_height], return the value of that range.
  let (range_existence_bitmap, range_leaf_bitmap) =
  - InternalNode::range_bitmaps(start, width, (existence_bitmap, leaf_bitmap));
  + Self::range_bitmaps(start, width, (existence_bitmap, leaf_bitmap));
  if range_existence_bitmap == 0 {
  // No child under this subtree
  *SPARSE_MERKLE_PLACEHOLDER_HASH
  @@ -445,11 +445,8 @@ impl InternalNode {
  (existence_bitmap, leaf_bitmap),
  ));
  - let (range_existence_bitmap, range_leaf_bitmap) = InternalNode::range_bitmaps(
  - child_half_start,
  - width,
  - (existence_bitmap, leaf_bitmap),
  - );
  + let (range_existence_bitmap, range_leaf_bitmap) =
  + Self::range_bitmaps(child_half_start, width, (existence_bitmap, leaf_bitmap));
  if range_existence_bitmap == 0 {
  // No child in this range.
  