Merge from mainline.

First initialize DAG otherwise dwarf writer is used uninitialized.
Duncan spotted this. Thanks!

llvm-svn: 63793

Author: tlattner

llvm/lib/CodeGen/SelectionDAG/SelectionDAG.cpp

@@ -787,7 +787,7 @@ unsigned SelectionDAG::getMVTAlignment(MVT VT) const {
 }
 
 SelectionDAG::SelectionDAG(TargetLowering &tli, FunctionLoweringInfo &fli)
-  : TLI(tli), FLI(fli),
+  : TLI(tli), FLI(fli), DW(0),
     EntryNode(ISD::EntryToken, getVTList(MVT::Other)),
     Root(getEntryNode()) {
   AllNodes.push_back(&EntryNode);

llvm/lib/CodeGen/SelectionDAG/SelectionDAGISel.cpp

@@ -313,10 +313,10 @@ bool SelectionDAGISel::runOnFunction(Function &Fn) {
   RegInfo = &MF->getRegInfo();
   DOUT << "\n\n\n=== " << Fn.getName() << "\n";
 
-  FuncInfo->set(Fn, *MF, *CurDAG, EnableFastISel);
   MachineModuleInfo *MMI = getAnalysisIfAvailable<MachineModuleInfo>();
   DwarfWriter *DW = getAnalysisIfAvailable<DwarfWriter>();
   CurDAG->init(*MF, MMI, DW);
+  FuncInfo->set(Fn, *MF, *CurDAG, EnableFastISel);
   SDL->init(GFI, *AA);
 
   for (Function::iterator I = Fn.begin(), E = Fn.end(); I != E; ++I)