Revert "Flattening: remove the LowerSwitchPass application for now (see issue #18)"

This reverts commit af9a5ba03b21e72c641c5ef6d958feef6dc802c2.

Author: eskarn

flattening/Flattening.cpp

@@ -254,8 +254,7 @@ PreservedAnalyses FlatteningObfuscatorPass::run(Function &F,
 
   PreservedAnalyses analysis = PreservedAnalyses::all();
 
-  // TODO: check if this is even necessary
-  //analysis.intersect(LowerSwitchPass().run(F, AM));
+  analysis.intersect(LowerSwitchPass().run(F, AM));
 
   analysis.intersect(runFlattening(F) ? PreservedAnalyses::none()
                                       : PreservedAnalyses::all());