[WIP] Translate _d_array{,set}ctor to templates

[Vild]

druntime PR: dlang/druntime#2655

[dlang-bot]

Thanks for your pull request and interest in making D better, @Vild! We are looking forward to reviewing it, and you should be hearing from a maintainer soon.
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[JinShil]

@Vild Does this just need a rebase?

[Vild]

@Vild Does this just need a rebase?

I found some bugs when compiling with -O, so I'm currently looking into them.

[UplinkCoder]

Why did this need changes to ctfe?

[RazvanN7]

Superseded by: #13116