add num_cpus crate test

Author: RalfJung

test_dependencies/Cargo.lock

@@ -12,6 +12,7 @@ edition = "2021"
 tokio = { version = "1.0", features = ["full"] }
 libc = "0.2"
 page_size = "0.4.1"
+num_cpus = "1.10.1"
 
 getrandom_1 = { package = "getrandom", version = "0.1" }
 getrandom_2 = { package = "getrandom", version = "0.2" }

test_dependencies/Cargo.toml

@@ -0,0 +1,5 @@
+//@compile-flags: -Zmiri-disable-isolation
+
+fn main() {
+    assert_eq!(num_cpus::get(), 1);
+}

tests/pass/crates/num_cpus.rs

@@ -1,6 +1,6 @@
-use rand::{rngs::SmallRng, Rng, SeedableRng};
 // mac-os `getrandom_1` does some pointer shenanigans
 //@compile-flags: -Zmiri-permissive-provenance
+use rand::{rngs::SmallRng, Rng, SeedableRng};
 
 fn main() {
     // Test `getrandom` directly (in multiple different versions).