Update clang to r339409.

Change-Id: I800772d2d838223be1f6b40d490c4591b937fca2
diff --git a/linux-x64/clang/include/llvm/ProfileData/ProfileCommon.h b/linux-x64/clang/include/llvm/ProfileData/ProfileCommon.h
index 51b065b..087588f 100644
--- a/linux-x64/clang/include/llvm/ProfileData/ProfileCommon.h
+++ b/linux-x64/clang/include/llvm/ProfileData/ProfileCommon.h
@@ -61,7 +61,7 @@
   void computeDetailedSummary();
 
 public:
-  /// \brief A vector of useful cutoff values for detailed summary.
+  /// A vector of useful cutoff values for detailed summary.
   static const ArrayRef<uint32_t> DefaultCutoffs;
 };