D GC Benchmark Suite

[bearophile]

Leandro Lucarella:
> I've just tested it and it seems to work great (it even improves the
> performance of other mini benchmarks I've collected).

But I have found some situations where it leads to a bit slower performance (no, I don't remember how/where now). So it deserves a lot of testing.

Regarding the D GC, I'd like it to be more precise (no need for it to be fully precise).

Bye,
bearophile