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Draft: smallarray prefetch primops

doyougnu requested to merge doyougnu/ghc:wip/smallarray-prefetch-primops into master

What

This MR adds prefetch operations for Array#, MutableArray#, SmallArray#, and SmallMutableArray#

Todos

  • Add primops
  • refactor mkBasicPrefetch
  • verify the prefetch works
  • add tests
  • squash commits

Why

  • closes out #10809
  • Helps solve some performance issues in popular libraries, see this issue in unordered-containers
Edited by doyougnu

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