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

[jkotas]

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.

[jkotas]

The fix should be to either make the Sort fully managed (preferred) or to add GC polls to the current unmanaged implementation.

Related: https://github.com/dotnet/coreclr/issues/27106
Related: dotnet/coreclr#24419