[Issue 21027] Backend: DMD use 'rep stosb' even for ulong arrays

[d-bugmail at puremagic.com]

https://issues.dlang.org/show_bug.cgi?id=21027

--- Comment #1 from Walter Bright <bugzilla at digitalmars.com> ---
This turns out to be a problem introduced by
https://github.com/dlang/dmd/pull/9828

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