ClangTools: Sanitize parameter order

The path to the serialized diagnostics log is the main parameter, so put
it first.

Change-Id: I8865aad302b0e5d3008dab606ab774167cebda3c
Reviewed-by: Cristian Adam <cristian.adam@qt.io>
Reviewed-by: Nikolai Kosjar <nikolai.kosjar@qt.io>

src/plugins/clangtools/clangtoolslogfilereader.h

@@ -34,9 +34,9 @@ namespace Utils { class FilePath; }
 namespace ClangTools {
 namespace Internal {
 
-Diagnostics readSerializedDiagnostics(const Utils::FilePath &filePath,
+Diagnostics readSerializedDiagnostics(const Utils::FilePath &logFilePath,
+                                      const Utils::FilePath &mainFilePath,
                                       const QSet<Utils::FilePath> &projectFiles,
-                                      const Utils::FilePath &logFilePath,
                                       QString *errorMessage);
 
 } // namespace Internal