[Issue 19123] -allinst gives undefined reference linker errors

[d-bugmail at puremagic.com]

https://issues.dlang.org/show_bug.cgi?id=19123

--- Comment #4 from Mike Franklin <slavo5150 at yahoo.com> ---
I've narrowed this down somewhat.  What's happening is `-allinst` causes
symbols to be emitted to the object file that otherwise wouldn't be.  Those
symbols, however, call other symbols, and it's those other symbols that aren't
being emitted for some reason, resulting in linker errors.

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