This wasn't headers, just missing namespaces.

/me bows head in shame.

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@189172 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/Serialization/ASTWriter.cpp b/lib/Serialization/ASTWriter.cpp
index 1186bfb..7f1bd9b 100644
--- a/lib/Serialization/ASTWriter.cpp
+++ b/lib/Serialization/ASTWriter.cpp
@@ -43,7 +43,6 @@
 #include "llvm/ADT/APFloat.h"
 #include "llvm/ADT/APInt.h"
 #include "llvm/ADT/Hashing.h"
-#include "llvm/ADT/STLExtras.h"
 #include "llvm/ADT/StringExtras.h"
 #include "llvm/Bitcode/BitstreamWriter.h"
 #include "llvm/Support/FileSystem.h"
@@ -4662,8 +4661,8 @@
     return;
   }
 
-  LocDeclIDsTy::iterator
-    I = std::upper_bound(Decls.begin(), Decls.end(), LocDecl, less_first());
+  LocDeclIDsTy::iterator I =
+      std::upper_bound(Decls.begin(), Decls.end(), LocDecl, llvm::less_first());
 
   Decls.insert(I, LocDecl);
 }