[LCG] Remove the Module reference member which we weren't using for

anything and doesn't make sense if assigning.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@206449 91177308-0d34-0410-b5e6-96231b3b80d8

include/llvm/Analysis/LazyCallGraph.h

@@ -209,8 +209,6 @@ public:
   }
 
 private:
-  Module &M;
-
   /// \brief Allocator that holds all the call graph nodes.
   SpecificBumpPtrAllocator<Node> BPA;