Long GC pause times caused by Array.Sort of primitive array

Repro:
```
static void Main()
{
    new Thread(() =>
    {
        var src = new int[10_000_000];
        for (;;) Array.Sort(src);
    }).Start();
    for (;;) { Console.WriteLine("GC start"); GC.Collect(); Console.WriteLine("GC end"); Thread.Sleep(1); }
}
```

Result: The GC takes very long time - if it finishes at all.