ledger tool halt at slot verify hash (#23424) (#23677)

(cherry picked from commit ef8b7d9c62)

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

ledger/src/blockstore_processor.rs

@@ -1383,6 +1383,8 @@ fn load_frozen_forks(
             )?;
 
             if slot >= dev_halt_at_slot {
+                bank.force_flush_accounts_cache();
+                let _ = bank.verify_bank_hash(false);
                 break;
             }
         }

runtime/src/bank.rs

@@ -5750,7 +5750,7 @@ impl Bank {
     /// snapshot.
     /// Only called from startup or test code.
     #[must_use]
-    fn verify_bank_hash(&self, test_hash_calculation: bool) -> bool {
+    pub fn verify_bank_hash(&self, test_hash_calculation: bool) -> bool {
         self.rc.accounts.verify_bank_hash_and_lamports(
             self.slot(),
             &self.ancestors,