Improve use of CfgLocalAllocator and introduce containers that use it.

src/IceCfg.h

Index: src/IceCfg.h
diff --git a/src/IceCfg.h b/src/IceCfg.h
index 4147dd9500f101b4611d0bbbad0fccf36b0626c3..62a891496fe372155b3c461c41cbf4d03fdab912 100644
--- a/src/IceCfg.h
+++ b/src/IceCfg.h
@@ -273,7 +273,7 @@ private:
   std::unique_ptr<Assembler> TargetAssembler;
   /// Globals required by this CFG. Mostly used for the profiler's globals.
   std::unique_ptr<VariableDeclarationList> GlobalInits;
-  std::vector<InstJumpTable *> JumpTables;
+  CfgVector<InstJumpTable *> JumpTables;
 
   /// CurrentNode is maintained during dumping/emitting just for validating
   /// Variable::DefNode. Normally, a traversal over CfgNodes maintains this, but