Update clang to r339409.

Change-Id: I800772d2d838223be1f6b40d490c4591b937fca2
diff --git a/linux-x64/clang/include/llvm/CodeGen/LoopTraversal.h b/linux-x64/clang/include/llvm/CodeGen/LoopTraversal.h
index a816f6d..750da01 100644
--- a/linux-x64/clang/include/llvm/CodeGen/LoopTraversal.h
+++ b/linux-x64/clang/include/llvm/CodeGen/LoopTraversal.h
@@ -101,7 +101,7 @@
   };
   LoopTraversal() {}
 
-  /// \brief Identifies basic blocks that are part of loops and should to be
+  /// Identifies basic blocks that are part of loops and should to be
   ///  visited twice and returns efficient traversal order for all the blocks.
   typedef SmallVector<TraversedMBBInfo, 4> TraversalOrder;
   TraversalOrder traverse(MachineFunction &MF);