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.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@152877 91177308-0d34-0410-b5e6-96231b3b80d8

lib/CodeGen/SelectionDAG/SelectionDAG.cpp

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