Add memory operation syscalls (backport #16447) (#18149)

* Add memory operation syscalls (#16447)

(cherry picked from commit 2b50529265)

# Conflicts:
#	programs/bpf/Cargo.lock
#	programs/bpf/rust/sysvar/tests/lib.rs
#	programs/bpf/tests/programs.rs
#	programs/bpf_loader/src/syscalls.rs
#	sdk/src/feature_set.rs

* resolve conflicts

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

programs/bpf/rust/mem/tests/lib.rs

@@ -0,0 +1,23 @@
+use solana_bpf_rust_mem::entrypoint::process_instruction;
+use solana_program_test::*;
+use solana_sdk::{
+    instruction::Instruction, pubkey::Pubkey, signature::Signer, transaction::Transaction,
+};
+
+#[tokio::test]
+async fn test_mem() {
+    let program_id = Pubkey::new_unique();
+    let program_test = ProgramTest::new(
+        "solana_bpf_rust_mem",
+        program_id,
+        processor!(process_instruction),
+    );
+    let (mut banks_client, payer, recent_blockhash) = program_test.start().await;
+
+    let mut transaction = Transaction::new_with_payer(
+        &[Instruction::new_with_bincode(program_id, &(), vec![])],
+        Some(&payer.pubkey()),
+    );
+    transaction.sign(&[&payer], recent_blockhash);
+    banks_client.process_transaction(transaction).await.unwrap();
+}