[ANNOUNCE] GHC 8.2.1 release candidate 1

[Boespflug, Mathieu]

> > * Compiler performance: do you have any numbers to quantify what 8.0 vs 8.2
> > is likely to look like?
>
> I'm afraid the best I can provide at the moment is [1]. On closer
> inspection of these I'm a bit suspicious of the 8.0 numbers; I'll try to
> reproduce them (and characterize the current ghc-8.2 branch, which fixes
> a significant memory leak present in -rc1) shortly. That being said,
> there were a few major fixes in 8.2.

I'm not sure how to interpret these numbers. Looking at the compile
time section, it seems to report an average 81% *increase* in
compilation time, but compared to what - ghc-8.0 or ghc-7.4?