Remove StgTypeArg since it was never used and is probably broken anyway

compiler/codeGen/CgBindery.lhs

@@ -411,15 +411,12 @@ getArgAmode (StgLitArg lit)
   = do  { cmm_lit <- cgLit lit
         ; return (typeCgRep (literalType lit), CmmLit cmm_lit) }
 
-getArgAmode (StgTypeArg _) = panic "getArgAmode: type arg"
-
 getArgAmodes :: [StgArg] -> FCode [(CgRep, CmmExpr)]
 getArgAmodes [] = returnFC []
 getArgAmodes (atom:atoms)
-  | isStgTypeArg atom = getArgAmodes atoms
-  | otherwise         = do { amode  <- getArgAmode  atom 
-                           ; amodes <- getArgAmodes atoms
-                           ; return ( amode : amodes ) }
+  = do { amode  <- getArgAmode  atom 
+       ; amodes <- getArgAmodes atoms
+       ; return ( amode : amodes ) }
 \end{code}
 
 %************************************************************************

compiler/codeGen/StgCmmEnv.hs

@@ -201,7 +201,6 @@ getArgAmode :: NonVoid StgArg -> FCode CmmExpr
 getArgAmode (NonVoid (StgVarArg var))  =
   do { info  <- getCgIdInfo var; return (idInfoToAmode info) }
 getArgAmode (NonVoid (StgLitArg lit))  = liftM CmmLit $ cgLit lit
-getArgAmode (NonVoid (StgTypeArg _))   = panic "getArgAmode: type arg"
 
 getNonVoidArgAmodes :: [StgArg] -> FCode [CmmExpr]
 -- NB: Filters out void args, 

compiler/stgSyn/StgLint.lhs

@@ -83,7 +83,6 @@ lintStgBindings whodunnit binds
 lintStgArg :: StgArg -> LintM (Maybe Type)
 lintStgArg (StgLitArg lit) = return (Just (literalType lit))
 lintStgArg (StgVarArg v)   = lintStgVar v
-lintStgArg a               = pprPanic "lintStgArg" (ppr a)
 
 lintStgVar :: Id -> LintM (Maybe Kind)
 lintStgVar v = do checkInScope v

compiler/stgSyn/StgSyn.lhs

@@ -35,7 +35,7 @@ module StgSyn (
 
         -- utils
         stgBindHasCafRefs, stgArgHasCafRefs, stgRhsArity,
-        isDllConApp, isStgTypeArg,
+        isDllConApp,
         stgArgType,
 
         pprStgBinding, pprStgBindings, pprStgBindingsWithSRTs,
@@ -99,11 +99,6 @@ data GenStgBinding bndr occ
 data GenStgArg occ
   = StgVarArg  occ
   | StgLitArg  Literal
-  | StgTypeArg Type     -- For when we want to preserve all type info
-
-isStgTypeArg :: StgArg -> Bool
-isStgTypeArg (StgTypeArg _) = True
-isStgTypeArg _              = False
 
 -- | Does this constructor application refer to
 -- anything in a different *Windows* DLL?
@@ -144,7 +139,6 @@ isAddrRep _       = False
 stgArgType :: StgArg -> Type
 stgArgType (StgVarArg v)   = idType v
 stgArgType (StgLitArg lit) = literalType lit
-stgArgType (StgTypeArg _)  = panic "stgArgType called on stgTypeArg"
 \end{code}
 
 %************************************************************************
@@ -683,7 +677,6 @@ instance (Outputable bndr, Outputable bdee, Ord bdee)
 pprStgArg :: (Outputable bdee) => GenStgArg bdee -> SDoc
 pprStgArg (StgVarArg var) = ppr var
 pprStgArg (StgLitArg con) = ppr con
-pprStgArg (StgTypeArg ty) = char '@' <+> ppr ty
 
 pprStgExpr :: (Outputable bndr, Outputable bdee, Ord bdee)
            => GenStgExpr bndr bdee -> SDoc