[Issue 18670] compiler segfault if `new` on a union type with dip1000

[d-bugmail at puremagic.com]

https://issues.dlang.org/show_bug.cgi?id=18670

--- Comment #6 from RazvanN <razvan.nitu1305 at gmail.com> ---
Closed the former one to retarget stable :
https://github.com/dlang/dmd/pull/8095

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