Update clang to r339409.

Change-Id: I800772d2d838223be1f6b40d490c4591b937fca2
diff --git a/linux-x64/clang/include/llvm/MC/MCDisassembler/MCExternalSymbolizer.h b/linux-x64/clang/include/llvm/MC/MCDisassembler/MCExternalSymbolizer.h
index bd3e5d4..df909a0 100644
--- a/linux-x64/clang/include/llvm/MC/MCDisassembler/MCExternalSymbolizer.h
+++ b/linux-x64/clang/include/llvm/MC/MCDisassembler/MCExternalSymbolizer.h
@@ -22,7 +22,7 @@
 
 namespace llvm {
 
-/// \brief Symbolize using user-provided, C API, callbacks.
+/// Symbolize using user-provided, C API, callbacks.
 ///
 /// See llvm-c/Disassembler.h.
 class MCExternalSymbolizer : public MCSymbolizer {