[Issue 14458] very slow ubyte[] assignment (dmd doesn't use memset)

[d-bugmail at puremagic.com]

https://issues.dlang.org/show_bug.cgi?id=14458

--- Comment #2 from Walter Bright <bugzilla at digitalmars.com> ---
Not going to bother with OPstrcpy or OPstrcmp as they are never generated by
DMD.

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