miri: increase weak memory test iterations

Author: joboet

src/tools/miri/tests/pass/0weak_memory/weak.rs

@@ -44,7 +44,7 @@ fn check_all_outcomes<T: Eq + std::hash::Hash + std::fmt::Debug>(
     let expected: HashSet<T> = HashSet::from_iter(expected);
     let mut seen = HashSet::new();
     // Let's give it N times as many tries as we are expecting values.
-    let tries = expected.len() * 16;
+    let tries = expected.len() * 24;
     for i in 0..tries {
         let val = generate();
         assert!(expected.contains(&val), "got an unexpected value: {val:?}");