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

4 files changed, 29 insertions, 17 deletions

diff --git a/compiler/GHC/Tc/TyCl/Build.hs b/compiler/GHC/Tc/TyCl/Build.hs
index 93f5eedb50..52a5592d67 100644
--- a/compiler/GHC/Tc/TyCl/Build.hs
+++ b/compiler/GHC/Tc/TyCl/Build.hs
@@ -34,6 +34,7 @@ import GHC.Core.Class
 import GHC.Core.TyCon
 import GHC.Core.Type
 import GHC.Types.Id
+import GHC.Types.SourceText
 import GHC.Tc.Utils.TcType
 import GHC.Core.Multiplicity
 
diff --git a/compiler/GHC/Tc/TyCl/Class.hs b/compiler/GHC/Tc/TyCl/Class.hs
index baad1622c0..92be85fa06 100644
--- a/compiler/GHC/Tc/TyCl/Class.hs
+++ b/compiler/GHC/Tc/TyCl/Class.hs
@@ -45,7 +45,6 @@ import GHC.Core.Multiplicity
 import GHC.Tc.Types.Origin
 import GHC.Tc.Utils.TcType
 import GHC.Tc.Utils.Monad
-import GHC.Driver.Phases (HscSource(..))
 import GHC.Tc.TyCl.Build( TcMethInfo )
 import GHC.Core.Class
 import GHC.Core.Coercion ( pprCoAxiom )
@@ -58,6 +57,7 @@ import GHC.Types.Name.Env
 import GHC.Types.Name.Set
 import GHC.Types.Var
 import GHC.Types.Var.Env
+import GHC.Types.SourceFile (HscSource(..))
 import GHC.Utils.Outputable
 import GHC.Utils.Panic
 import GHC.Types.SrcLoc
diff --git a/compiler/GHC/Tc/TyCl/Instance.hs b/compiler/GHC/Tc/TyCl/Instance.hs
index 4cc8a79e1e..cc47d1e348 100644
--- a/compiler/GHC/Tc/TyCl/Instance.hs
+++ b/compiler/GHC/Tc/TyCl/Instance.hs
@@ -67,11 +67,13 @@ import GHC.Types.Var.Env
 import GHC.Types.Var.Set
 import GHC.Data.Bag
 import GHC.Types.Basic
+import GHC.Types.Fixity
 import GHC.Driver.Session
 import GHC.Driver.Ppr
 import GHC.Utils.Error
 import GHC.Data.FastString
 import GHC.Types.Id
+import GHC.Types.SourceText
 import GHC.Data.List.SetOps
 import GHC.Types.Name
 import GHC.Types.Name.Set
diff --git a/compiler/GHC/Tc/TyCl/Utils.hs b/compiler/GHC/Tc/TyCl/Utils.hs
index a225fbdd6d..8755fbf762 100644
--- a/compiler/GHC/Tc/TyCl/Utils.hs
+++ b/compiler/GHC/Tc/TyCl/Utils.hs
@@ -34,40 +34,49 @@ import GHC.Prelude
 import GHC.Tc.Utils.Monad
 import GHC.Tc.Utils.Env
 import GHC.Tc.Gen.Bind( tcValBinds )
+import GHC.Tc.Utils.TcType
+
+import GHC.Builtin.Types( unitTy )
+import GHC.Builtin.Uniques ( mkBuiltinUnique )
+
+import GHC.Hs
+
 import GHC.Core.TyCo.Rep( Type(..), Coercion(..), MCoercion(..), UnivCoProvenance(..) )
 import GHC.Core.Multiplicity
-import GHC.Tc.Utils.TcType
 import GHC.Core.Predicate
-import GHC.Builtin.Types( unitTy )
 import GHC.Core.Make( rEC_SEL_ERROR_ID )
-import GHC.Hs
 import GHC.Core.Class
 import GHC.Core.Type
-import GHC.Driver.Types
 import GHC.Core.TyCon
 import GHC.Core.ConLike
 import GHC.Core.DataCon
-import GHC.Types.Name
-import GHC.Types.Name.Env
-import GHC.Types.Name.Reader ( mkVarUnqual )
-import GHC.Types.Id
-import GHC.Types.Id.Info
-import GHC.Types.Var.Env
-import GHC.Types.Var.Set
-import GHC.Types.Unique.Set
 import GHC.Core.TyCon.Set
 import GHC.Core.Coercion ( ltRole )
-import GHC.Types.Basic
-import GHC.Types.SrcLoc
-import GHC.Builtin.Uniques ( mkBuiltinUnique )
+
 import GHC.Utils.Outputable
 import GHC.Utils.Panic
 import GHC.Utils.Misc
+import GHC.Utils.FV as FV
+
 import GHC.Data.Maybe
 import GHC.Data.Bag
 import GHC.Data.FastString
-import GHC.Utils.FV as FV
+
 import GHC.Unit.Module
+
+import GHC.Types.Basic
+import GHC.Types.SrcLoc
+import GHC.Types.SourceFile
+import GHC.Types.SourceText
+import GHC.Types.Name
+import GHC.Types.Name.Env
+import GHC.Types.Name.Reader ( mkVarUnqual )
+import GHC.Types.Id
+import GHC.Types.Id.Info
+import GHC.Types.Var.Env
+import GHC.Types.Var.Set
+import GHC.Types.Unique.Set
+import GHC.Types.TyThing
 import qualified GHC.LanguageExtensions as LangExt
 
 import Control.Monad