[Issue 18864] Building 64-bit dmd on Windows results in a debug build. The release build doesn't work.

[d-bugmail at puremagic.com]

https://issues.dlang.org/show_bug.cgi?id=18864

--- Comment #1 from Atila Neves <atila.neves at gmail.com> ---
Further information:  the 64-bit dmd artifact from AppVeyor also seems to fail
with -int.max/2 every now and again, as does any dmd I compiled with dmd
2.080.0 on Windows. It doesn't always fail, but it results in flaky CI builds.

--