Refactored Simplify passwip/refactor-latecc

 * Removed references to driver from GHC.Core.LateCC, GHC.Core.Simplify
   namespace and GHC.Core.Opt.Stats.
   Also removed services from configuration records.

 * Renamed GHC.Core.Opt.Simplify to GHC.Core.Opt.Simplify.Iteration.

 * Inlined `simplifyPgm` and renamed `simplifyPgmIO` to `simplifyPgm`
   and moved the Simplify driver to GHC.Core.Opt.Simplify.

 * Moved `SimplMode` and `FloatEnable` to GHC.Core.Opt.Simplify.Env.

 * Added a configuration record `TopEnvConfig` for the `SimplTopEnv` environment
   in GHC.Core.Opt.Simplify.Monad.

 * Added `SimplifyOpts` and `SimplifyExprOpts`. Provide initialization functions
   for those in a new module GHC.Driver.Config.Core.Opt.Simplify.
   Also added initialization functions for `SimplMode` to that module.

 * Moved `CoreToDo` and friends to a new module GHC.Core.Pipeline.Types
   and the counting types and functions (`SimplCount` and `Tick`) to new
   module GHC.Core.Opt.Stats.

 * Added getter functions for the fields of `SimplMode`. The pedantic bottoms
   option and the platform are retrieved from the ArityOpts and RuleOpts and the
   getter functions allow us to retrieve values from `SpecEnv` without the
   knowledge where the data is stored exactly.

 * Moved the coercion optimization options from the top environment to
   `SimplMode`. This way the values left in the top environment are those
   dealing with monadic functionality, namely logging, IO related stuff and
   counting. Added a note "The environments of the Simplify pass".

 * Removed `CoreToDo` from GHC.Core.Lint and GHC.CoreToStg.Prep and got rid of
   `CoreDoSimplify`. Pass `SimplifyOpts` in the `CoreToDo` type instead.

 * Prep work before removing `InteractiveContext` from `HscEnv`.

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