Update clang to r339409.

Change-Id: I800772d2d838223be1f6b40d490c4591b937fca2
diff --git a/linux-x64/clang/include/llvm/ADT/StringSwitch.h b/linux-x64/clang/include/llvm/ADT/StringSwitch.h
index 9e07303..b7860b9 100644
--- a/linux-x64/clang/include/llvm/ADT/StringSwitch.h
+++ b/linux-x64/clang/include/llvm/ADT/StringSwitch.h
@@ -20,7 +20,7 @@
 
 namespace llvm {
 
-/// \brief A switch()-like statement whose cases are string literals.
+/// A switch()-like statement whose cases are string literals.
 ///
 /// The StringSwitch class is a simple form of a switch() statement that
 /// determines whether the given string matches one of the given string
@@ -41,10 +41,10 @@
 /// \endcode
 template<typename T, typename R = T>
 class StringSwitch {
-  /// \brief The string we are matching.
+  /// The string we are matching.
   const StringRef Str;
 
-  /// \brief The pointer to the result of this switch statement, once known,
+  /// The pointer to the result of this switch statement, once known,
   /// null before that.
   Optional<T> Result;