selection dag doesn't need DwarfWriter, remove some tendrils.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@100382 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/CodeGen/SelectionDAG/SelectionDAG.cpp b/lib/CodeGen/SelectionDAG/SelectionDAG.cpp
index 7291c5a..7dea29c 100644
--- a/lib/CodeGen/SelectionDAG/SelectionDAG.cpp
+++ b/lib/CodeGen/SelectionDAG/SelectionDAG.cpp
@@ -793,7 +793,7 @@
 
 // EntryNode could meaningfully have debug info if we can find it...
 SelectionDAG::SelectionDAG(TargetLowering &tli, FunctionLoweringInfo &fli)
-  : TLI(tli), FLI(fli), DW(0),
+  : TLI(tli), FLI(fli),
     EntryNode(ISD::EntryToken, DebugLoc(), getVTList(MVT::Other)),
     Root(getEntryNode()), Ordering(0) {
   AllNodes.push_back(&EntryNode);
@@ -801,11 +801,9 @@
   DbgInfo = new SDDbgInfo();
 }
 
-void SelectionDAG::init(MachineFunction &mf, MachineModuleInfo *mmi,
-                        DwarfWriter *dw) {
+void SelectionDAG::init(MachineFunction &mf, MachineModuleInfo *mmi) {
   MF = &mf;
   MMI = mmi;
-  DW = dw;
   Context = &mf.getFunction()->getContext();
 }