fix bpf lddw check (#13554) (#13558)

(cherry picked from commit 30ef53cb13)

Co-authored-by: Jack May <jack@solana.com>

programs/bpf_loader/src/lib.rs

@@ -350,6 +350,15 @@ mod tests {
             .unwrap();
     }
 
+    #[test]
+    #[should_panic(expected = "VerifierError(LDDWCannotBeLast)")]
+    fn test_bpf_loader_check_load_dw() {
+        let prog = &[
+            0x18, 0x00, 0x00, 0x00, 0x88, 0x77, 0x66, 0x55, // first half of lddw
+        ];
+        bpf_verifier::check(prog, true).unwrap();
+    }
+
     #[test]
     fn test_bpf_loader_write() {
         let program_id = solana_sdk::pubkey::new_rand();