Update clang to r339409.

Change-Id: I800772d2d838223be1f6b40d490c4591b937fca2
diff --git a/linux-x64/clang/include/llvm/Transforms/IPO.h b/linux-x64/clang/include/llvm/Transforms/IPO.h
index 1514335..ebc76bf 100644
--- a/linux-x64/clang/include/llvm/Transforms/IPO.h
+++ b/linux-x64/clang/include/llvm/Transforms/IPO.h
@@ -222,7 +222,7 @@
   Export, ///< Export information to summary.
 };
 
-/// \brief This pass lowers type metadata and the llvm.type.test intrinsic to
+/// This pass lowers type metadata and the llvm.type.test intrinsic to
 /// bitsets.
 ///
 /// The behavior depends on the summary arguments:
@@ -235,10 +235,10 @@
 ModulePass *createLowerTypeTestsPass(ModuleSummaryIndex *ExportSummary,
                                      const ModuleSummaryIndex *ImportSummary);
 
-/// \brief This pass export CFI checks for use by external modules.
+/// This pass export CFI checks for use by external modules.
 ModulePass *createCrossDSOCFIPass();
 
-/// \brief This pass implements whole-program devirtualization using type
+/// This pass implements whole-program devirtualization using type
 /// metadata.
 ///
 /// The behavior depends on the summary arguments: