Propagate debug info when building SelectionDAG.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@63359 91177308-0d34-0410-b5e6-96231b3b80d8

include/llvm/CodeGen/SelectionDAG.h

@@ -79,6 +79,9 @@ class SelectionDAG {
   MachineModuleInfo *MMI;
   DwarfWriter *DW;
 
+  /// CurDebugLoc - current file + line number.  Changes as we build the DAG.
+  DebugLoc CurDebugLoc;
+
   /// EntryNode - The starting token.
   SDNode EntryNode;
 
@@ -137,6 +140,7 @@ public:
   FunctionLoweringInfo &getFunctionLoweringInfo() const { return FLI; }
   MachineModuleInfo *getMachineModuleInfo() const { return MMI; }
   DwarfWriter *getDwarfWriter() const { return DW; }
+  DebugLoc getCurDebugLoc() const { return CurDebugLoc; }
 
   /// viewGraph - Pop up a GraphViz/gv window with the DAG rendered using 'dot'.
   ///
@@ -195,6 +199,8 @@ public:
     return Root = N;
   }
 
+  void setCurDebugLoc(DebugLoc dl) { CurDebugLoc = dl; }
+
   /// Combine - This iterates over the nodes in the SelectionDAG, folding
   /// certain types of nodes together, or eliminating superfluous nodes.  The
   /// Level argument controls whether Combine is allowed to produce nodes and