Add registers in rust

bench/programs_rust/fpga-lib/src/lib.rs

@@ -0,0 +1,13 @@
+#![no_std]
+
+pub mod register;
+
+#[macro_export]
+macro_rules! panic_handler {
+    () => {
+        #[panic_handler]
+        fn panic(_info: &core::panic::PanicInfo) -> ! {
+            loop {}
+        }
+    };
+}

bench/programs_rust/fpga-lib/src/register.rs

@@ -0,0 +1,3 @@
+pub struct Reg<const N: usize> {}
+
+fpga_lib_macros::define_regs! {}