Simon Jakobi authored Mar 31, 2020 and Marge Bot committed May 14, 2020

* Replace some non-deterministic lazy folds with
  strict folds.
* Replace some O(n log n) folds in deterministic order
  with O(n) non-deterministic folds.
* Replace some folds with set-operations on the underlying
  IntMaps.

This reduces max residency when compiling
`nofib/spectral/simple/Main.hs` with -O0 by about 1%.

Maximum residency when compiling Cabal also seems reduced on the
order of 3-9%.