First-time contributor -- speeding up `std::unique_ptr` compilation

[Jonathan Wakely]

On Sat, 25 Jun 2022 at 13:45, Vittorio Romeo wrote:
>
> Thank you, Jonathan, for the very thorough explanation and for pointing out that I completely forgot to consider ABI stability in this case.
>
> I still think that it might be worthwhile to attempt some work in this area as multiple projects I work on have various TUs using unique_ptr but not tuple. I will look into the refactoring you suggested.

Something like this would avoid instantiating most of std::tuple while
preserving ABI, but it doesn't seem to really make much difference to
compilation time.
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