Use fetch_max instead

[recmo]

On 2019-09-24 @recmo wrote in 0ed4308 “Refactor, use Relax”:

Use fetch_max instead
See https://doc.rust-lang.org/std/sync/atomic/struct.AtomicUsize.html#method.fetch_max
This is pending rust-lang/rust#48655

        System.dealloc(ptr, layout);
        let _ = self.allocated.fetch_sub(layout.size(), Relaxed);
    }
}

// TODO: Use `fetch_max` instead
// See https://doc.rust-lang.org/std/sync/atomic/struct.AtomicUsize.html#method.fetch_max
// This is pending https://github.com/rust-lang/rust/issues/48655
fn fetch_max(atom: &AtomicUsize, value: usize) -> usize {
    let mut prev = atom.load(Relaxed);
    while prev < value {
        match atom.compare_exchange_weak(prev, value, Relaxed, Relaxed) {
            Ok(_) => return value,

From utils/logging-allocator/src/logging_allocator.rs:125