Add uncached tree hashing

eth2/utils/tree_hash/src/impls.rs

@@ -1,44 +0,0 @@
-use super::resize::{grow_merkle_cache, shrink_merkle_cache};
-use super::*;
-use ssz::ssz_encode;
-
-mod vec;
-
-impl CachedTreeHashSubTree<u64> for u64 {
-    fn item_type() -> ItemType {
-        ItemType::Basic
-    }
-
-    fn new_cache(&self) -> Result<TreeHashCache, Error> {
-        Ok(TreeHashCache::from_bytes(
-            merkleize(ssz_encode(self)),
-            false,
-        )?)
-    }
-
-    fn btree_overlay(&self, chunk_offset: usize) -> Result<BTreeOverlay, Error> {
-        BTreeOverlay::from_lengths(chunk_offset, vec![1])
-    }
-
-    fn packed_encoding(&self) -> Result<Vec<u8>, Error> {
-        Ok(ssz_encode(self))
-    }
-
-    fn packing_factor() -> usize {
-        HASHSIZE / 8
-    }
-
-    fn update_cache(
-        &self,
-        other: &Self,
-        cache: &mut TreeHashCache,
-        chunk: usize,
-    ) -> Result<usize, Error> {
-        if self != other {
-            let leaf = merkleize(ssz_encode(self));
-            cache.modify_chunk(chunk, &leaf)?;
-        }
-
-        Ok(chunk + 1)
-    }
-}