40ef11ec86
* implements copy-on-write for staked-nodes (#19090)
Bank::staked_nodes and Bank::epoch_staked_nodes redundantly clone
staked-nodes HashMap even though an immutable reference will suffice:
https://github.com/solana-labs/solana/blob/a9014cece/runtime/src/vote_account.rs#L77
This commit implements copy-on-write semantics for staked-nodes by
wrapping the underlying HashMap in Arc<...>.
(cherry picked from commit f302774cf7)
# Conflicts:
# runtime/src/bank.rs
# runtime/src/stakes.rs
# runtime/src/vote_account.rs
* removes backport merge conflicts
Co-authored-by: behzad nouri <behzadnouri@gmail.com>