Update clang to r339409.

Change-Id: I800772d2d838223be1f6b40d490c4591b937fca2
diff --git a/linux-x64/clang/include/llvm/Support/SystemUtils.h b/linux-x64/clang/include/llvm/Support/SystemUtils.h
index 2997b1b..bd60793 100644
--- a/linux-x64/clang/include/llvm/Support/SystemUtils.h
+++ b/linux-x64/clang/include/llvm/Support/SystemUtils.h
@@ -21,7 +21,7 @@
 /// Determine if the raw_ostream provided is connected to a terminal. If so,
 /// generate a warning message to errs() advising against display of bitcode
 /// and return true. Otherwise just return false.
-/// @brief Check for output written to a console
+/// Check for output written to a console
 bool CheckBitcodeOutputToConsole(
   raw_ostream &stream_to_check, ///< The stream to be checked
   bool print_warning = true     ///< Control whether warnings are printed