Update clang to r339409.

Change-Id: I800772d2d838223be1f6b40d490c4591b937fca2
diff --git a/linux-x64/clang/include/llvm/ADT/DenseSet.h b/linux-x64/clang/include/llvm/ADT/DenseSet.h
index 7e5171c..b495e25 100644
--- a/linux-x64/clang/include/llvm/ADT/DenseSet.h
+++ b/linux-x64/clang/include/llvm/ADT/DenseSet.h
@@ -17,7 +17,7 @@
 #include "llvm/ADT/DenseMap.h"
 #include "llvm/ADT/DenseMapInfo.h"
 #include "llvm/Support/type_traits.h"
-#include <algorithm> 
+#include <algorithm>
 #include <cstddef>
 #include <initializer_list>
 #include <iterator>