[Issue 14686] Postblit isn't sometimes called on concatenation

[via Digitalmars-d-bugs]

https://issues.dlang.org/show_bug.cgi?id=14686

--- Comment #3 from Kenji Hara <k.hara.pg at gmail.com> ---
(In reply to Kenji Hara from comment #1)
> https://github.com/D-Programming-Language/dmd/pull/4741

That PR also contains other changes. So I opened one more PR only for this bug.

https://github.com/D-Programming-Language/dmd/pull/4869

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