[Issue 23493] __xtoHash is not exported

[d-bugmail at puremagic.com]

https://issues.dlang.org/show_bug.cgi?id=23493

--- Comment #1 from Richard Cattermole <alphaglosined at gmail.com> ---
During testing I was actually using LDC when I hit this, so it may not in fact
be a dmd bug.

But after looking at dmd.clone, I'm not seeing anything obvious stating that
these generated functions are indeed getting added to the export table. So I'm
going to leave it open, because this very likely does need to be done.

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