Update clang to r339409.

Change-Id: I800772d2d838223be1f6b40d490c4591b937fca2
diff --git a/linux-x64/clang/include/llvm/Analysis/CFG.h b/linux-x64/clang/include/llvm/Analysis/CFG.h
index d569464..cccdd16 100644
--- a/linux-x64/clang/include/llvm/Analysis/CFG.h
+++ b/linux-x64/clang/include/llvm/Analysis/CFG.h
@@ -49,7 +49,7 @@
 bool isCriticalEdge(const TerminatorInst *TI, unsigned SuccNum,
                     bool AllowIdenticalEdges = false);
 
-/// \brief Determine whether instruction 'To' is reachable from 'From',
+/// Determine whether instruction 'To' is reachable from 'From',
 /// returning true if uncertain.
 ///
 /// Determine whether there is a path from From to To within a single function.
@@ -68,7 +68,7 @@
                             const DominatorTree *DT = nullptr,
                             const LoopInfo *LI = nullptr);
 
-/// \brief Determine whether block 'To' is reachable from 'From', returning
+/// Determine whether block 'To' is reachable from 'From', returning
 /// true if uncertain.
 ///
 /// Determine whether there is a path from From to To within a single function.
@@ -78,7 +78,7 @@
                             const DominatorTree *DT = nullptr,
                             const LoopInfo *LI = nullptr);
 
-/// \brief Determine whether there is at least one path from a block in
+/// Determine whether there is at least one path from a block in
 /// 'Worklist' to 'StopBB', returning true if uncertain.
 ///
 /// Determine whether there is a path from at least one block in Worklist to
@@ -90,7 +90,7 @@
                                     const DominatorTree *DT = nullptr,
                                     const LoopInfo *LI = nullptr);
 
-/// \brief Return true if the control flow in \p RPOTraversal is irreducible.
+/// Return true if the control flow in \p RPOTraversal is irreducible.
 ///
 /// This is a generic implementation to detect CFG irreducibility based on loop
 /// info analysis. It can be used for any kind of CFG (Loop, MachineLoop,