Note this is a modified backport that does not SAVE the new fields, but does load them. (#24074)

Original:
Start saving/loading prior_roots(_with_hash) to snapshot (#23844)

    * Start saving/loading prior_roots(_with_hash) to snapshot

    * Update runtime/src/accounts_index.rs

    Co-authored-by: Michael Vines <mvines@gmail.com>

    * Update runtime/src/accounts_index.rs

    Co-authored-by: Michael Vines <mvines@gmail.com>

    * update comment

    Co-authored-by: Michael Vines <mvines@gmail.com>
    (cherry picked from commit 396b49a7c1)

Co-authored-by: Jeff Washington (jwash) <wash678@gmail.com>

sdk/src/deserialize_utils.rs

@@ -12,6 +12,7 @@ where
     let result = T::deserialize(d);
     match result {
         Err(err) if err.to_string() == "io error: unexpected end of file" => Ok(T::default()),
+        Err(err) if err.to_string() == "io error: failed to fill whole buffer" => Ok(T::default()),
         result => result,
     }
 }