Update clang to r339409.

Change-Id: I800772d2d838223be1f6b40d490c4591b937fca2
diff --git a/linux-x64/clang/include/llvm/MC/MCSymbolWasm.h b/linux-x64/clang/include/llvm/MC/MCSymbolWasm.h
index 10eadb0..e043453 100644
--- a/linux-x64/clang/include/llvm/MC/MCSymbolWasm.h
+++ b/linux-x64/clang/include/llvm/MC/MCSymbolWasm.h
@@ -45,6 +45,7 @@
   bool isFunction() const { return Type == wasm::WASM_SYMBOL_TYPE_FUNCTION; }
   bool isData() const { return Type == wasm::WASM_SYMBOL_TYPE_DATA; }
   bool isGlobal() const { return Type == wasm::WASM_SYMBOL_TYPE_GLOBAL; }
+  bool isSection() const { return Type == wasm::WASM_SYMBOL_TYPE_SECTION; }
   wasm::WasmSymbolType getType() const { return Type; }
   void setType(wasm::WasmSymbolType type) { Type = type; }