Add snapshot hash of full accounts state (#8295)

* Add snapshot hash of full accounts state

* Use normal hashing for the accounts delta state

* Add merkle

runtime/src/accounts.rs

@@ -15,7 +15,6 @@ use log::*;
 use rayon::slice::ParallelSliceMut;
 use solana_sdk::{
     account::Account,
-    bank_hash::BankHash,
     clock::Slot,
     hash::Hash,
     native_loader,
@@ -510,16 +509,19 @@ impl Accounts {
         }
     }
 
-    pub fn bank_hash_at(&self, slot_id: Slot) -> BankHash {
+    pub fn bank_hash_at(&self, slot_id: Slot) -> Hash {
         self.bank_hash_info_at(slot_id).hash
     }
 
     pub fn bank_hash_info_at(&self, slot_id: Slot) -> BankHashInfo {
+        let delta_hash = self.accounts_db.get_accounts_delta_hash(slot_id);
         let bank_hashes = self.accounts_db.bank_hashes.read().unwrap();
-        bank_hashes
+        let mut hash_info = bank_hashes
             .get(&slot_id)
             .expect("No bank hash was found for this bank, that should not be possible")
-            .clone()
+            .clone();
+        hash_info.hash = delta_hash;
+        hash_info
     }
 
     /// This function will prevent multiple threads from modifying the same account state at the
@@ -1313,7 +1315,7 @@ mod tests {
     #[should_panic]
     fn test_accounts_empty_bank_hash() {
         let accounts = Accounts::new(Vec::new());
-        accounts.bank_hash_at(0);
+        accounts.bank_hash_at(1);
     }
 
     fn check_accounts(accounts: &Accounts, pubkeys: &Vec<Pubkey>, num: usize) {