Use -XImpredicativeTypes instead of -fglasgow-exts

testsuite/tests/ghc-regress/boxy/Base1.hs

-{-# OPTIONS_GHC -fglasgow-exts #-}
+{-# OPTIONS_GHC -XImpredicativeTypes #-}
 
 module Base1 where 
 -- basic examples of impredicative instantiation of variables 

testsuite/tests/ghc-regress/boxy/Compose.hs

-{-# OPTIONS_GHC -fglasgow-exts #-}
+{-# OPTIONS_GHC -XImpredicativeTypes -XEmptyDataDecls -XGADTs #-}
 
 -- Trac #1118
 

testsuite/tests/ghc-regress/boxy/PList1.hs

-{-# OPTIONS_GHC -fglasgow-exts #-}
+{-# OPTIONS_GHC -XImpredicativeTypes #-}
 
 module PList1 where 
 -- Polymorphic lists 1: requires smart-app-res  

testsuite/tests/ghc-regress/boxy/PList2.hs

-{-# OPTIONS_GHC -fglasgow-exts #-}
+{-# OPTIONS_GHC -XImpredicativeTypes #-}
 
 module PList2 where 
 -- Polymorphic lists 2: require smart-app-arg & smart-app-res: Should fail w/o smart-app-arg

testsuite/tests/ghc-regress/boxy/boxy.hs

-{-# OPTIONS_GHC -fglasgow-exts #-}
+{-# OPTIONS_GHC -XImpredicativeTypes -XScopedTypeVariables #-}
 
 module ShouldCompile where
 

testsuite/tests/ghc-regress/ghci.debugger/scripts/print033.script

 -- Resolving an impredicative type
-:set -fglasgow-exts
+:set -XImpredicativeTypes
 :m + Control.Monad.ST
 let u = undefined :: ST s (forall s'. ST s' a)
 :p u

testsuite/tests/ghc-regress/simplCore/should_compile/simpl017.hs

-{-# OPTIONS_GHC -fglasgow-exts #-}
+{-# OPTIONS -XImpredicativeTypes -XEmptyDataDecls -XGADTs -XLiberalTypeSynonyms -XFlexibleInstances #-}
 
 -- See Trac #1627.  The point is that we should get nice
 -- 		    compact code for Foo

testsuite/tests/ghc-regress/typecheck/should_compile/tc211.hs

-{-# OPTIONS -fglasgow-exts #-}
+{-# OPTIONS_GHC -XImpredicativeTypes -XScopedTypeVariables -XGADTs #-}
 
 -- Here are a bunch of tests for impredicative polymorphism
 -- mainly written by Dimitrios

testsuite/tests/ghc-regress/typecheck/should_compile/tc214.hs

-{-# OPTIONS_GHC -fglasgow-exts #-}
+{-# OPTIONS_GHC -XImpredicativeTypes -XGADTs #-}
 
 -- This program sent GHC 6.6 into a loop, because the fixpointing
 -- of the substitution in type refinement got its in-scope-set

testsuite/tests/ghc-regress/typecheck/should_fail/tcfail165.hs

-{-# OPTIONS -fglasgow-exts #-}
+{-# OPTIONS -XImpredicativeTypes #-}
 
 module ShouldFail where
 

testsuite/tests/ghc-regress/typecheck/should_fail/tcfail174.hs

-{-# OPTIONS -fglasgow-exts #-}
+{-# OPTIONS -XImpredicativeTypes #-}
 
 module Foo where