Added source file/line correspondence for dwarf (PowerPC only at this point.)

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@24748 91177308-0d34-0410-b5e6-96231b3b80d8

include/llvm/CodeGen/SelectionDAGNodes.h

@@ -352,6 +352,12 @@ namespace ISD {
     // as output.
     LOCATION,
     
+    // DEBUG_LOC - This node is used to represent source line information
+    // embedded in the code.  It takes token chain as input, then a line number,
+    // then a column then a file id (provided by MachineDebugInfo.  It produces
+    // a token chain as output.
+    DEBUG_LOC,
+    
     // BUILTIN_OP_END - This must be the last enum value in this list.
     BUILTIN_OP_END,
   };