Perf for T5837

[Bartosz Nitka]

I commented on https://phabricator.haskell.org/rGHCd675a354e8db67d87d1f257c3d1d2bf2d58c2b3f
that Harbormaster started failing after this.
It reproduced locally for me.
You can see here:
https://phabricator.haskell.org/diffusion/GHC/history/master/ that the
revert fixed the build.

2018-03-05 8:50 GMT+00:00 Simon Peyton Jones via ghc-devs
<ghc-devs at haskell.org>:
> Ben
>
> Why did you revert this?
>
> commit 2756117bd26c2cb70d3f51954a88b7d7bdf3d3f2
>
> Author: Ben Gamari <ben at smart-cactus.org>
>
> Date:   Thu Mar 1 14:06:04 2018 -0500
>
>
>
>     Revert "Better stats for T5837"
>
>
>
>     This reverts commit d675a354e8db67d87d1f257c3d1d2bf2d58c2b3f.
>
>
>
> -           (wordsize(64), 55813608, 7)])
>
> +           (wordsize(64), 51294232, 7)])
>
>
>
> It’s consistently 8% better for me, but I guess not for you.
>
> Does anyone else find this?
>
> Simon
>
>
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