[Issue 16352] dead-lock in std.allocator.free_list unittest

[via Digitalmars-d-bugs]

https://issues.dlang.org/show_bug.cgi?id=16352

--- Comment #7 from safety0ff.bugz <safety0ff.bugz at gmail.com> ---
(In reply to safety0ff.bugz from comment #6)
> 
> But the value of `next` could have changed between the load and the cas.

I meant `oldRoot.next`. i.e. next != oldRoot.next after the cas succeeds.

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