[Issue 19946] In betterC filling an array with a non-zero value fails for types of size > 1 due to missing _memset16/_memset32/etc.

[d-bugmail at puremagic.com]

https://issues.dlang.org/show_bug.cgi?id=19946

--- Comment #21 from Walter Bright <bugzilla at digitalmars.com> ---
More progress: https://github.com/dlang/dmd/pull/14788

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