Why does the RTS run GC right before shutting down?

[Edward Z. Yang]

I believe it's so that we can run finalizers before shutdown.

Excerpts from Ömer Sinan Ağacan's message of 2018-04-06 16:49:41 +0300:
> Hi,
> 
> I'm wondering why we run GC in this line:
> 
> https://github.com/ghc/ghc/blob/master/rts/Schedule.c#L2670
> 
> I went back in commit history using git blame and found the commit that
> introduced that line (5638488ba28), but it didn't help. Does anyone know why we
> need that line?
> 
> Thanks,
> 
> Ömer