Update aosp/master Clang for rebase to r222490.

Change-Id: Ic557ac55e97fbf6ee08771c7b7c3594777b0aefd
diff --git a/lib/Frontend/HeaderIncludeGen.cpp b/lib/Frontend/HeaderIncludeGen.cpp
index 8b2435b..2701194 100644
--- a/lib/Frontend/HeaderIncludeGen.cpp
+++ b/lib/Frontend/HeaderIncludeGen.cpp
@@ -54,13 +54,12 @@
 
   // Open the output file, if used.
   if (!OutputPath.empty()) {
-    std::string Error;
+    std::error_code EC;
     llvm::raw_fd_ostream *OS = new llvm::raw_fd_ostream(
-        OutputPath.str().c_str(), Error,
-        llvm::sys::fs::F_Append | llvm::sys::fs::F_Text);
-    if (!Error.empty()) {
-      PP.getDiagnostics().Report(
-        clang::diag::warn_fe_cc_print_header_failure) << Error;
+        OutputPath.str(), EC, llvm::sys::fs::F_Append | llvm::sys::fs::F_Text);
+    if (EC) {
+      PP.getDiagnostics().Report(clang::diag::warn_fe_cc_print_header_failure)
+          << EC.message();
       delete OS;
     } else {
       OS->SetUnbuffered();
@@ -70,9 +69,12 @@
     }
   }
 
-  PP.addPPCallbacks(new HeaderIncludesCallback(&PP, ShowAllHeaders,
-                                               OutputFile, OwnsOutputFile,
-                                               ShowDepth, MSStyle));
+  PP.addPPCallbacks(llvm::make_unique<HeaderIncludesCallback>(&PP,
+                                                              ShowAllHeaders,
+                                                              OutputFile,
+                                                              OwnsOutputFile,
+                                                              ShowDepth,
+                                                              MSStyle));
 }
 
 void HeaderIncludesCallback::FileChanged(SourceLocation Loc,
@@ -131,5 +133,6 @@
     Msg += '\n';
 
     OutputFile->write(Msg.data(), Msg.size());
+    OutputFile->flush();
   }
 }