Debugger: Make "debug last command" button work for LLDB

Change-Id: I0ac7a531a7537e9e41055d815bdf204c7ec4a73d
Reviewed-by: hjk <hjk121@nokiamail.com>

src/plugins/debugger/lldb/lldbengine.h

@@ -192,6 +192,8 @@ private:
         QList<WatchData> *list);
 
     void runCommand(const Command &cmd);
+    void debugLastCommand();
+    Command m_lastDebuggableCommand;
 
     QByteArray m_inbuffer;
     QString m_scriptFileName;