[Issue 18899] destroy is inefficient for small structs

[d-bugmail at puremagic.com]

https://issues.dlang.org/show_bug.cgi?id=18899

--- Comment #8 from Steven Schveighoffer <schveiguy at yahoo.com> ---
(In reply to Steven Schveighoffer from comment #7)
> See the generated AST

...generated *assembly*

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