Add LANGUAGE pragmas to compiler/ source files

In some cases, the layout of the LANGUAGE/OPTIONS_GHC lines has been
reorganized, while following the convention, to

- place `{-# LANGUAGE #-}` pragmas at the top of the source file, before
  any `{-# OPTIONS_GHC #-}`-lines.

- Moreover, if the list of language extensions fit into a single
  `{-# LANGUAGE ... -#}`-line (shorter than 80 characters), keep it on one
  line. Otherwise split into `{-# LANGUAGE ... -#}`-lines for each
  individual language extension. In both cases, try to keep the
  enumeration alphabetically ordered.
  (The latter layout is preferable as it's more diff-friendly)

While at it, this also replaces obsolete `{-# OPTIONS ... #-}` pragma
occurences by `{-# OPTIONS_GHC ... #-}` pragmas.

3 files changed, 4 insertions, 1 deletions

diff --git a/compiler/nativeGen/RegAlloc/Graph/Main.hs b/compiler/nativeGen/RegAlloc/Graph/Main.hs
index dbaf5098ce..05db68dd46 100644
--- a/compiler/nativeGen/RegAlloc/Graph/Main.hs
+++ b/compiler/nativeGen/RegAlloc/Graph/Main.hs
@@ -1,3 +1,5 @@
+{-# LANGUAGE ScopedTypeVariables #-}
+
 -- | Graph coloring register allocator.
 module RegAlloc.Graph.Main (
         regAlloc
diff --git a/compiler/nativeGen/RegAlloc/Graph/Stats.hs b/compiler/nativeGen/RegAlloc/Graph/Stats.hs
index 7bc842d1c9..8fada96ee2 100644
--- a/compiler/nativeGen/RegAlloc/Graph/Stats.hs
+++ b/compiler/nativeGen/RegAlloc/Graph/Stats.hs
@@ -1,3 +1,4 @@
+{-# LANGUAGE BangPatterns, CPP #-}
 
 -- | Carries interesting info for debugging / profiling of the
 --   graph coloring register allocator.
diff --git a/compiler/nativeGen/RegAlloc/Graph/TrivColorable.hs b/compiler/nativeGen/RegAlloc/Graph/TrivColorable.hs
index 2d58ed9981..eba2e43149 100644
--- a/compiler/nativeGen/RegAlloc/Graph/TrivColorable.hs
+++ b/compiler/nativeGen/RegAlloc/Graph/TrivColorable.hs
@@ -1,4 +1,4 @@
-{-# LANGUAGE BangPatterns #-}
+{-# LANGUAGE BangPatterns, CPP #-}
 
 module RegAlloc.Graph.TrivColorable (
         trivColorable,