Validator CLI option to enable just-in-time compilation of BPF (#13789)

* Adds a CLI option to the validator to enable just-in-time compilation of BPF.

* Refactoring to use bpf_loader_program instead of feature_set to pass JIT flag from the validator CLI to the executor.

ledger/src/blockstore_processor.rs

@@ -311,6 +311,7 @@ pub type ProcessCallback = Arc<dyn Fn(&Bank) + Sync + Send>;
 
 #[derive(Default, Clone)]
 pub struct ProcessOptions {
+    pub bpf_jit: bool,
     pub poh_verify: bool,
     pub full_leader_cache: bool,
     pub dev_halt_at_slot: Option<Slot>,
@@ -342,7 +343,10 @@ pub fn process_blockstore(
         account_paths,
         &opts.frozen_accounts,
         opts.debug_keys.clone(),
-        Some(&crate::builtins::get(genesis_config.cluster_type)),
+        Some(&crate::builtins::get(
+            genesis_config.cluster_type,
+            opts.bpf_jit,
+        )),
     );
     let bank0 = Arc::new(bank0);
     info!("processing ledger for slot 0...");