add openvm basic compile test corpus

tests/openvm/compile/basic/Cargo.toml

@@ -0,0 +1,11 @@
+[package]
+name = "ere-test-openvm-guest"
+version = "0.1.0"
+edition = "2021"
+
+[workspace]
+
+[dependencies]
+openvm = { git = "https://github.com/openvm-org/openvm.git", features = [
+    "std",
+] }

tests/openvm/compile/basic/src/main.rs

@@ -0,0 +1,14 @@
+use openvm::io::{read, reveal_u32};
+
+fn main() {
+    let n: u64 = read();
+    let mut a: u64 = 0;
+    let mut b: u64 = 1;
+    for _ in 0..n {
+        let c: u64 = a.wrapping_add(b);
+        a = b;
+        b = c;
+    }
+    reveal_u32(a as u32, 0);
+    reveal_u32((a >> 32) as u32, 1);
+}