Update clang to r339409.

Change-Id: I800772d2d838223be1f6b40d490c4591b937fca2
diff --git a/linux-x64/clang/include/llvm/Analysis/ObjCARCAliasAnalysis.h b/linux-x64/clang/include/llvm/Analysis/ObjCARCAliasAnalysis.h
index db524ff..559c77c 100644
--- a/linux-x64/clang/include/llvm/Analysis/ObjCARCAliasAnalysis.h
+++ b/linux-x64/clang/include/llvm/Analysis/ObjCARCAliasAnalysis.h
@@ -29,7 +29,7 @@
 namespace llvm {
 namespace objcarc {
 
-/// \brief This is a simple alias analysis implementation that uses knowledge
+/// This is a simple alias analysis implementation that uses knowledge
 /// of ARC constructs to answer queries.
 ///
 /// TODO: This class could be generalized to know about other ObjC-specific