Revert r152613 (and r152614), "Inline the d'tor and add an anchor instead." for workaround of g++-4.4's miscompilation.

It caused MSP430DAGToDAGISel::SelectIndexedBinOp() to be miscompiled.
When two ReplaceUses()'s are expanded as inline, vtable in base class is stored to latter (ISelUpdater)ISU.

llvm-svn: 152877

llvm/include/llvm/CodeGen/SelectionDAG.h

@@ -820,9 +820,8 @@ public:
   /// the DAG can optionally implement this interface.  This allows the clients
   /// to handle the various sorts of updates that happen.
   class DAGUpdateListener {
-    virtual void anchor();
   public:
-    virtual ~DAGUpdateListener() {}
+    virtual ~DAGUpdateListener();
 
     /// NodeDeleted - The node N that was deleted and, if E is not null, an
     /// equivalent node E that replaced it.

llvm/lib/CodeGen/SelectionDAG/SelectionDAG.cpp

@@ -70,7 +70,7 @@ static const fltSemantics *EVTToAPFloatSemantics(EVT VT) {
   }
 }
 
-void SelectionDAG::DAGUpdateListener::anchor() {}
+SelectionDAG::DAGUpdateListener::~DAGUpdateListener() {}
 
 //===----------------------------------------------------------------------===//
 //                              ConstantFPSDNode Class