Update clang to r339409.

Change-Id: I800772d2d838223be1f6b40d490c4591b937fca2
diff --git a/linux-x64/clang/include/llvm/CodeGen/RuntimeLibcalls.h b/linux-x64/clang/include/llvm/CodeGen/RuntimeLibcalls.h
index 016bef1..28567a1 100644
--- a/linux-x64/clang/include/llvm/CodeGen/RuntimeLibcalls.h
+++ b/linux-x64/clang/include/llvm/CodeGen/RuntimeLibcalls.h
@@ -29,7 +29,7 @@
   ///
   enum Libcall {
 #define HANDLE_LIBCALL(code, name) code,
-    #include "RuntimeLibcalls.def"
+    #include "llvm/IR/RuntimeLibcalls.def"
 #undef HANDLE_LIBCALL
   };