Add more from the std

crates/std/src/sys/random/unsupported.rs

@@ -0,0 +1,15 @@
+use crate::ptr;
+
+pub fn fill_bytes(_: &mut [u8]) {
+    panic!("this target does not support random data generation");
+}
+
+pub fn hashmap_random_keys() -> (u64, u64) {
+    // Use allocation addresses for a bit of randomness. This isn't
+    // particularly secure, but there isn't really an alternative.
+    let stack = 0u8;
+    let heap = Box::new(0u8);
+    let k1 = ptr::from_ref(&stack).addr() as u64;
+    let k2 = ptr::from_ref(&*heap).addr() as u64;
+    (k1, k2)
+}