Simplify account.rent_epoch handling for sysvar rent (#16049)

* Add some code for special local testing

* Add comment to store_account_and_update_capitalization

* Simplify account.rent_epoch handling for sysvar rent

* Introduce *_for_test functions

* Add deprecation messages to existing api

sdk/src/native_loader.rs

@@ -1,14 +1,32 @@
-use crate::account::{Account, AccountSharedData};
+use crate::account::{
+    Account, AccountSharedData, InheritableAccountFields, DUMMY_INHERITABLE_ACCOUNT_FIELDS,
+};
+use crate::clock::INITIAL_RENT_EPOCH;
 
 crate::declare_id!("NativeLoader1111111111111111111111111111111");
 
 /// Create an executable account with the given shared object name.
+#[deprecated(
+    since = "1.5.17",
+    note = "Please use `create_loadable_account_for_test` instead"
+)]
 pub fn create_loadable_account(name: &str, lamports: u64) -> AccountSharedData {
+    create_loadable_account_with_fields(name, (lamports, INITIAL_RENT_EPOCH))
+}
+
+pub fn create_loadable_account_with_fields(
+    name: &str,
+    (lamports, rent_epoch): InheritableAccountFields,
+) -> AccountSharedData {
     AccountSharedData::from(Account {
         lamports,
         owner: id(),
         data: name.as_bytes().to_vec(),
         executable: true,
-        rent_epoch: 0,
+        rent_epoch,
     })
 }
+
+pub fn create_loadable_account_for_test(name: &str) -> AccountSharedData {
+    create_loadable_account_with_fields(name, DUMMY_INHERITABLE_ACCOUNT_FIELDS)
+}