Simon Peyton Jones authored Jul 18, 2022 and Marge Bot committed Jul 25, 2022

This patch addresses #21831, point 2.  See
Note [generaliseDictPats] in SpecConstr

I took the opportunity to refactor the construction of specialisation
rules a bit, so that the rule name says what type we are specialising
at.

Surprisingly, there's a 20% decrease in compile time for test
perf/compiler/T18223. I took a look at it, and the code size seems the
same throughout. I did a quick ticky profile which seemed to show a
bit less substitution going on.  Hmm.  Maybe it's the "don't do
eta-expansion in stable unfoldings" patch, which is part of the
same MR as this patch.

Anyway, since it's a move in the right direction, I didn't think it
was worth looking into further.

Metric Decrease:
    T18223