Update clang to r339409.

Change-Id: I800772d2d838223be1f6b40d490c4591b937fca2
diff --git a/linux-x64/clang/include/llvm/IR/OptBisect.h b/linux-x64/clang/include/llvm/IR/OptBisect.h
index cfc724c..aa24c94 100644
--- a/linux-x64/clang/include/llvm/IR/OptBisect.h
+++ b/linux-x64/clang/include/llvm/IR/OptBisect.h
@@ -47,7 +47,7 @@
 /// optimization-related problems.
 class OptBisect : public OptPassGate {
 public:
-  /// \brief Default constructor, initializes the OptBisect state based on the
+  /// Default constructor, initializes the OptBisect state based on the
   /// -opt-bisect-limit command line argument.
   ///
   /// By default, bisection is disabled.