Update clang to r339409.

Change-Id: I800772d2d838223be1f6b40d490c4591b937fca2
diff --git a/linux-x64/clang/include/llvm/Analysis/LoopUnrollAnalyzer.h b/linux-x64/clang/include/llvm/Analysis/LoopUnrollAnalyzer.h
index 80f3e5f..f45bf0b 100644
--- a/linux-x64/clang/include/llvm/Analysis/LoopUnrollAnalyzer.h
+++ b/linux-x64/clang/include/llvm/Analysis/LoopUnrollAnalyzer.h
@@ -57,7 +57,7 @@
   using Base::visit;
 
 private:
-  /// \brief A cache of pointer bases and constant-folded offsets corresponding
+  /// A cache of pointer bases and constant-folded offsets corresponding
   /// to GEP (or derived from GEP) instructions.
   ///
   /// In order to find the base pointer one needs to perform non-trivial
@@ -65,11 +65,11 @@
   /// results saved.
   DenseMap<Value *, SimplifiedAddress> SimplifiedAddresses;
 
-  /// \brief SCEV expression corresponding to number of currently simulated
+  /// SCEV expression corresponding to number of currently simulated
   /// iteration.
   const SCEV *IterationNumber;
 
-  /// \brief A Value->Constant map for keeping values that we managed to
+  /// A Value->Constant map for keeping values that we managed to
   /// constant-fold on the given iteration.
   ///
   /// While we walk the loop instructions, we build up and maintain a mapping