Add -reorder-basic-blocks option and fix nop insertion

src/IceCfg.h

Index: src/IceCfg.h
diff --git a/src/IceCfg.h b/src/IceCfg.h
index f2b5295e0bb1e14322eb1a75d5c9228609af6c8c..499e226a794103e79a994820191a6a4d7be870a9 100644
--- a/src/IceCfg.h
+++ b/src/IceCfg.h
@@ -180,6 +180,7 @@ public:
   void deletePhis();
   void advancedPhiLowering();
   void reorderNodes();
+  void shuffleNodes();
   void doAddressOpt();
   void doArgLowering();
   void doNopInsertion();