[Issue 22460] Unittest build of d_do_test.d triggers RangeError on OpenBSD

[d-bugmail at puremagic.com]

https://issues.dlang.org/show_bug.cgi?id=22460

--- Comment #3 from Brian Callahan <bcallah at openbsd.org> ---
Further analysis suggests that using -lowmem immediately segfaults full stop no
matter what you are compiling with dmd on 64-bit OpenBSD DMD.

I did not even think to check it because -lowmem works fine on 32-bit OpenBSD
DMD. So this is a bug specifically on 64-bit OpenBSD DMD.

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