Debugger: use FilePath in stack frames

Change-Id: I98b6aa60e1b72be3482916446b87cee89e6cf2a4
Reviewed-by: hjk <hjk@qt.io>

src/plugins/debugger/sourceutils.cpp

@@ -190,7 +190,7 @@ static void blockRecursion(const Overview &overview,
 
 QStringList getUninitializedVariables(const Snapshot &snapshot,
                                       const QString &functionName,
-                                      const QString &file,
+                                      const FilePath &file,
                                       int line)
 {
     QStringList result;