Clang: Store the database in user resources

We used temporary directories but this can be different paths.

Task-number: QTCREATORBUG-19372
Change-Id: Id6ac18e6eecdc5bb354bda3741e16cb87c552ba6
Reviewed-by: Ivan Donchevskii <ivan.donchevskii@qt.io>
Reviewed-by: Tim Jenssen <tim.jenssen@qt.io>

src/plugins/clangrefactoring/refactoringconnectionclient.cpp

@@ -25,6 +25,8 @@
 
 #include "refactoringconnectionclient.h"
 
+#include <coreplugin/icore.h>
+
 #include <utils/temporarydirectory.h>
 
 #include <QCoreApplication>
@@ -47,6 +49,8 @@ RefactoringConnectionClient::RefactoringConnectionClient(RefactoringClientInterf
       m_serverProxy(client, nullptr)
 {
     m_processCreator.setTemporaryDirectoryPattern("clangrefactoringbackend-XXXXXX");
+    m_processCreator.setArguments({connectionName(),
+                                   Core::ICore::userResourcePath() + "/symbol-experimental-v1.db"});
 
     stdErrPrefixer().setPrefix("RefactoringConnectionClient.stderr: ");
     stdOutPrefixer().setPrefix("RefactoringConnectionClient.stdout: ");