[Issue 20360] std.variant doesn't do postblit/dtor correctly for large structs

[d-bugmail at puremagic.com]

https://issues.dlang.org/show_bug.cgi?id=20360

--- Comment #1 from John Colvin <john.loughran.colvin at gmail.com> ---
related to https://issues.dlang.org/show_bug.cgi?id=12944

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