Minimal changes for LLVM to compile under VS11.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@151849 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/CodeGen/AsmPrinter/DwarfDebug.cpp b/lib/CodeGen/AsmPrinter/DwarfDebug.cpp
index 920f82d..58e40e1 100644
--- a/lib/CodeGen/AsmPrinter/DwarfDebug.cpp
+++ b/lib/CodeGen/AsmPrinter/DwarfDebug.cpp
@@ -530,7 +530,7 @@
 
   std::map<std::pair<std::string, std::string>, unsigned>::iterator I;
   bool NewlyInserted;
-  tie(I, NewlyInserted) = SourceIdMap.insert(Entry);
+  llvm::tie(I, NewlyInserted) = SourceIdMap.insert(Entry);
   if (!NewlyInserted)
     return I->second;