[Issue 24864] hasElaborateDestructor incorrectly true for structs with anonymous unions

[d-bugmail at puremagic.com]

https://issues.dlang.org/show_bug.cgi?id=24864

--- Comment #1 from Jonathan M Davis <issues.dlang at jmdavisProg.com> ---
hasElaborateAssign used to have this same problem, but the fix for
https://issues.dlang.org/show_bug.cgi?id=24835 inadvertently fixed it.

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