Add native program account constructor

sdk/src/native_loader.rs

@@ -1,3 +1,4 @@
+use crate::account::Account;
 use crate::pubkey::Pubkey;
 
 pub const NATIVE_LOADER_PROGRAM_ID: [u8; 32] = [
@@ -11,3 +12,14 @@ pub fn id() -> Pubkey {
 pub fn check_id(program_id: &Pubkey) -> bool {
     program_id.as_ref() == NATIVE_LOADER_PROGRAM_ID
 }
+
+/// Create an executable account owned by the given program_id and shared object name.
+pub fn create_program_account(program_id: Pubkey, name: &str) -> Account {
+    Account {
+        tokens: 1,
+        owner: program_id,
+        userdata: name.as_bytes().to_vec(),
+        executable: true,
+        loader: id(),
+    }
+}