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/membuiltins/src/lib.rs

@@ -0,0 +1,39 @@
+//! @brief Test builtin mem functions
+
+#![cfg(target_arch = "bpf")]
+#![feature(rustc_private)]
+
+extern crate compiler_builtins;
+use solana_bpf_rust_mem::{run_mem_tests, MemOps};
+use solana_program::{custom_panic_default, entrypoint::SUCCESS};
+
+#[no_mangle]
+pub extern "C" fn entrypoint(_input: *mut u8) -> u64 {
+    #[derive(Default)]
+    struct MemOpSyscalls();
+    impl MemOps for MemOpSyscalls {
+        fn memcpy(&self, dst: &mut [u8], src: &[u8], n: usize) {
+            unsafe {
+                compiler_builtins::mem::memcpy(dst.as_mut_ptr(), src.as_ptr(), n);
+            }
+        }
+        unsafe fn memmove(&self, dst: *mut u8, src: *mut u8, n: usize) {
+            compiler_builtins::mem::memmove(dst, src, n);
+        }
+        fn memset(&self, s: &mut [u8], c: u8, n: usize) {
+            unsafe {
+                compiler_builtins::mem::memset(s.as_mut_ptr(), c as i32, n);
+            }
+        }
+        fn memcmp(&self, s1: &[u8], s2: &[u8], n: usize) -> i32 {
+            unsafe { compiler_builtins::mem::memcmp(s1.as_ptr(), s2.as_ptr(), n) }
+        }
+    }
+    let mem_ops = MemOpSyscalls::default();
+
+    run_mem_tests(mem_ops);
+
+    SUCCESS
+}
+
+custom_panic_default!();