diff --git a/lib/CodeGen/MachineFunction.cpp b/lib/CodeGen/MachineFunction.cpp
index abd84ec..b303b1b 100644
--- a/lib/CodeGen/MachineFunction.cpp
+++ b/lib/CodeGen/MachineFunction.cpp
@@ -378,13 +378,14 @@
   return *mc;
 }
 
-/// lookUpDebugLocId - Look up the DebugLocTuple index with the given
-/// source file, line, and column. It may add a new filename and / or
-/// a new DebugLocTuple.
-unsigned MachineFunction::lookUpDebugLocId(unsigned Src, unsigned Line,
-                                           unsigned Col) {
+/// getOrCreateDebugLocID - Look up the DebugLocTuple index with the given
+/// source file, line, and column. If none currently exists, create add a new
+/// new DebugLocTuple and insert it into the DebugIdMap.
+unsigned MachineFunction::getOrCreateDebugLocID(unsigned Src, unsigned Line,
+                                                unsigned Col) {
   struct DebugLocTuple Tuple(Src, Line, Col);
-  DebugIdMapType::iterator II = DebugLocInfo.DebugIdMap.find(Tuple);
+  DenseMap<DebugLocTuple, unsigned>::iterator II
+    = DebugLocInfo.DebugIdMap.find(Tuple);
   if (II != DebugLocInfo.DebugIdMap.end())
     return II->second;
   // Add a new tuple.