Fix clippy::legacy_numeric_constants

(cherry picked from commit b2f7393)

Author: cuviper

rayon-core/src/latch.rs

@@ -2,7 +2,6 @@ use std::marker::PhantomData;
 use std::ops::Deref;
 use std::sync::atomic::{AtomicUsize, Ordering};
 use std::sync::{Arc, Condvar, Mutex};
-use std::usize;
 
 use crate::registry::{Registry, WorkerThread};
 

rayon-core/src/registry.rs

@@ -18,7 +18,6 @@ use std::ptr;
 use std::sync::atomic::{AtomicUsize, Ordering};
 use std::sync::{Arc, Mutex, Once};
 use std::thread;
-use std::usize;
 
 /// Thread builder used for customization via
 /// [`ThreadPoolBuilder::spawn_handler`](struct.ThreadPoolBuilder.html#method.spawn_handler).
@@ -599,10 +598,7 @@ impl Registry {
     pub(super) fn increment_terminate_count(&self) {
         let previous = self.terminate_count.fetch_add(1, Ordering::AcqRel);
         debug_assert!(previous != 0, "registry ref count incremented from zero");
-        assert!(
-            previous != std::usize::MAX,
-            "overflow in registry ref count"
-        );
+        assert!(previous != usize::MAX, "overflow in registry ref count");
     }
 
     /// Signals that the thread-pool which owns this registry has been

rayon-core/src/sleep/counters.rs

@@ -27,7 +27,7 @@ pub(super) struct Counters {
 pub(super) struct JobsEventCounter(usize);
 
 impl JobsEventCounter {
-    pub(super) const DUMMY: JobsEventCounter = JobsEventCounter(std::usize::MAX);
+    pub(super) const DUMMY: JobsEventCounter = JobsEventCounter(usize::MAX);
 
     #[inline]
     pub(super) fn as_usize(self) -> usize {

rayon-core/src/sleep/mod.rs

@@ -8,7 +8,6 @@ use crossbeam_utils::CachePadded;
 use std::sync::atomic::Ordering;
 use std::sync::{Condvar, Mutex};
 use std::thread;
-use std::usize;
 
 mod counters;
 pub(crate) use self::counters::THREADS_MAX;