Split GHC.Driver.Types

I was working on making DynFlags stateless (#17957), especially by
storing loaded plugins into HscEnv instead of DynFlags. It turned out to
be complicated because HscEnv is in GHC.Driver.Types but LoadedPlugin
isn't: it is in GHC.Driver.Plugins which depends on GHC.Driver.Types. I
didn't feel like introducing yet another hs-boot file to break the loop.

Additionally I remember that while we introduced the module hierarchy
(#13009) we talked about splitting GHC.Driver.Types because it contained
various unrelated types and functions, but we never executed. I didn't
feel like making GHC.Driver.Types bigger with more unrelated Plugins
related types, so finally I bit the bullet and split GHC.Driver.Types.

As a consequence this patch moves a lot of things. I've tried to put
them into appropriate modules but nothing is set in stone.

Several other things moved to avoid loops.

* Removed Binary instances from GHC.Utils.Binary for random compiler
  things
* Moved Typeable Binary instances into GHC.Utils.Binary.Typeable: they
  import a lot of things that users of GHC.Utils.Binary don't want to
  depend on.
* put everything related to Units/Modules under GHC.Unit:
  GHC.Unit.Finder, GHC.Unit.Module.{ModGuts,ModIface,Deps,etc.}
* Created several modules under GHC.Types: GHC.Types.Fixity, SourceText,
  etc.
* Split GHC.Utils.Error (into GHC.Types.Error)
* Finally removed GHC.Driver.Types

Note that this patch doesn't put loaded plugins into HscEnv. It's left
for another patch.

Bump haddock submodule

1 files changed, 34 insertions, 31 deletions

diff --git a/ghc/Main.hs b/ghc/Main.hs
index c079cb6893..41a2f9340a 100644
--- a/ghc/Main.hs
+++ b/ghc/Main.hs
@@ -18,58 +18,61 @@ module Main (main) where
 import qualified GHC
 import GHC              (parseTargetFiles,  Ghc, GhcMonad(..), Backend (..),
                           LoadHowMuch(..) )
-import GHC.Driver.CmdLine
 
--- Implementations of the various modes (--show-iface, mkdependHS. etc.)
-import GHC.Iface.Load       ( showIface )
+import GHC.Driver.CmdLine
+import GHC.Driver.Env
+import GHC.Driver.Phases
+import GHC.Driver.Session hiding (WarnReason(..))
+import GHC.Driver.Ppr
 import GHC.Driver.Main      ( newHscEnv )
 import GHC.Driver.Pipeline  ( oneShot, compileFile )
 import GHC.Driver.MakeFile  ( doMkDependHS )
 import GHC.Driver.Backpack  ( doBackpack )
+import GHC.Driver.Plugins
+
+import GHC.Platform
 import GHC.Platform.Ways
-#if defined(HAVE_INTERNAL_INTERPRETER)
-import GHCi.UI          ( interactiveUI, ghciWelcomeMsg, defaultGhciSettings )
-#endif
+import GHC.Platform.Host
 
--- Frontend plugins
-import GHC.Runtime.Loader   ( loadFrontendPlugin )
-import GHC.Driver.Plugins
 #if defined(HAVE_INTERNAL_INTERPRETER)
+import GHCi.UI              ( interactiveUI, ghciWelcomeMsg, defaultGhciSettings )
 import GHC.Runtime.Loader   ( initializePlugins )
 #endif
-import GHC.Unit.Module     ( ModuleName, mkModuleName )
 
+import GHC.Runtime.Loader   ( loadFrontendPlugin )
+
+import GHC.Unit.Module ( ModuleName, mkModuleName )
+import GHC.Unit.Module.ModIface
+import GHC.Unit.State  ( pprUnits, pprUnitsSimple )
+import GHC.Unit.Finder ( findImportedModule, cannotFindModule, FindResult(..) )
+import GHC.Unit.Types  ( IsBootInterface(..) )
 
--- Various other random stuff that we need
-import GHC.HandleEncoding
-import GHC.Platform
-import GHC.Platform.Host
-import GHC.Settings.Config
-import GHC.Settings.Constants
-import GHC.Driver.Types
-import GHC.Unit.State ( pprUnits, pprUnitsSimple )
-import GHC.Driver.Phases
 import GHC.Types.Basic     ( failed )
-import GHC.Driver.Session hiding (WarnReason(..))
-import GHC.Driver.Ppr
-import GHC.Utils.Error
-import GHC.Data.FastString
-import GHC.Utils.Outputable as Outputable
-import GHC.SysTools.BaseDir
-import GHC.Settings.IO
 import GHC.Types.SrcLoc
+import GHC.Types.SourceError
+import GHC.Types.Unique.Supply
+
+import GHC.Utils.Error
 import GHC.Utils.Misc
 import GHC.Utils.Panic
-import GHC.Types.Unique.Supply
+import GHC.Utils.Outputable as Outputable
 import GHC.Utils.Monad       ( liftIO )
+import GHC.Utils.Binary        ( openBinMem, put_ )
+
+import GHC.Settings.Config
+import GHC.Settings.Constants
+import GHC.Settings.IO
+
+import GHC.HandleEncoding
+import GHC.Data.FastString
+import GHC.SysTools.BaseDir
 
--- Imports for --abi-hash
+import GHC.Iface.Load       ( showIface )
 import GHC.Iface.Load          ( loadUserInterface )
-import GHC.Driver.Finder       ( findImportedModule, cannotFindModule )
-import GHC.Tc.Utils.Monad      ( initIfaceCheck )
-import GHC.Utils.Binary        ( openBinMem, put_ )
 import GHC.Iface.Recomp.Binary ( fingerprintBinMem )
 
+import GHC.Tc.Utils.Monad      ( initIfaceCheck )
+
 -- Standard Haskell libraries
 import System.IO
 import System.Environment