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/clangtool.h

@@ -50,9 +50,9 @@ public:
 
     virtual void startTool(bool askUserForFileSelection) = 0;
 
-    virtual Diagnostics read(const QString &filePath,
+    virtual Diagnostics read(const QString &logFilePath,
+                             const QString &mainFilePath,
                              const QSet<Utils::FilePath> &projectFiles,
-                             const QString &logFilePath,
                              QString *errorMessage) const = 0;
 
     FileInfos collectFileInfos(ProjectExplorer::Project *project,