[Issue 18928] extern(C++) bad codegen, wrong calling convention

[d-bugmail at puremagic.com]

https://issues.dlang.org/show_bug.cgi?id=18928

--- Comment #8 from Manu <turkeyman at gmail.com> ---
So, probability of a prompt fix? Is this just a matter of not having correct
information up front, or is the fix complicated by some issue?

We have an evaluation here that's kinda been shattered by this, but a fast fix
would really help recover the situation if it's possible.

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