Update clang to r339409.

Change-Id: I800772d2d838223be1f6b40d490c4591b937fca2
diff --git a/linux-x64/clang/include/llvm/Object/ModuleSymbolTable.h b/linux-x64/clang/include/llvm/Object/ModuleSymbolTable.h
index 9e93228..c3cbc27 100644
--- a/linux-x64/clang/include/llvm/Object/ModuleSymbolTable.h
+++ b/linux-x64/clang/include/llvm/Object/ModuleSymbolTable.h
@@ -57,6 +57,15 @@
   static void CollectAsmSymbols(
       const Module &M,
       function_ref<void(StringRef, object::BasicSymbolRef::Flags)> AsmSymbol);
+
+  /// Parse inline ASM and collect the symvers directives that are defined in
+  /// the current module.
+  ///
+  /// For each found symbol, call \p AsmSymver with the name of the symbol and
+  /// its alias.
+  static void
+  CollectAsmSymvers(const Module &M,
+                    function_ref<void(StringRef, StringRef)> AsmSymver);
 };
 
 } // end namespace llvm