[Issue 12800] Fibers are broken on Win64

[via Digitalmars-d-bugs]

https://issues.dlang.org/show_bug.cgi?id=12800

--- Comment #3 from Sönke Ludwig <sludwig at outerproduct.org> ---
It looks like there is still something wrong. The unit test for the 
FiberScheduler of the new std.concurrency additions crashes with an access 
violation inside Fiber.call().

https://github.com/D-Programming-Language/phobos/pull/1910

I didn't have a chance to investigate this deeper, yet. Reopening for now.

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