Decouple dynflags in GHC.Core.Opt.Arity (related to #17957)

Where is the key part of this patch? That is, what should reviewers look at first?

Removal of DynFlags from GHC.Core.Opt.Arity

Please take a few moments to verify that your commits fulfill the following:

  • are either individually buildable or squashed
  • have commit messages which describe what they do (referring to [Notes][notes] and tickets using #NNNN syntax when appropriate)
  • have added source comments describing your change. For larger changes you likely should add a [Note][notes] and cross-reference it from the relevant places.
Edited by andremarianiello

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