[Issue 12642] Avoid some heap allocation cases for fixed-size arrays

[via Digitalmars-d-bugs]

https://issues.dlang.org/show_bug.cgi?id=12642

--- Comment #1 from Kenji Hara <k.hara...@gmail.com> ---
If you remove @nogc annotation, all array literals will be allocated on stack.
So this is pure front-end issue, and may be fixed easily.

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