Update clang to r339409.

Change-Id: I800772d2d838223be1f6b40d490c4591b937fca2
diff --git a/linux-x64/clang/include/llvm/MC/MCParser/MCAsmParserExtension.h b/linux-x64/clang/include/llvm/MC/MCParser/MCAsmParserExtension.h
index ffb8d7a..1a132bc 100644
--- a/linux-x64/clang/include/llvm/MC/MCParser/MCAsmParserExtension.h
+++ b/linux-x64/clang/include/llvm/MC/MCParser/MCAsmParserExtension.h
@@ -20,7 +20,7 @@
 
 class Twine;
 
-/// \brief Generic interface for extending the MCAsmParser,
+/// Generic interface for extending the MCAsmParser,
 /// which is implemented by target and object file assembly parser
 /// implementations.
 class MCAsmParserExtension {
@@ -45,7 +45,7 @@
   MCAsmParserExtension &operator=(const MCAsmParserExtension &) = delete;
   virtual ~MCAsmParserExtension();
 
-  /// \brief Initialize the extension for parsing using the given \p Parser.
+  /// Initialize the extension for parsing using the given \p Parser.
   /// The extension should use the AsmParser interfaces to register its
   /// parsing routines.
   virtual void Initialize(MCAsmParser &Parser);