Valgrind: Add gui option "Detect self-modifying code"

Setting this option to e.g. "Everywhere Except in File-backend Mappings"
allows to 'valgrind' Qt Creator itself.

Without that option the valgrind process will die if certain code paths
are executed.

Change-Id: I8888456d324a25ce092f0b0128407adf2159f496
Reviewed-by: Leena Miettinen <riitta-leena.miettinen@digia.com>
Reviewed-by: hjk <hjk121@nokiamail.com>

src/plugins/valgrind/valgrindengine.h

@@ -73,6 +73,9 @@ private slots:
     void receiveProcessOutput(const QByteArray &output, Utils::OutputFormat format);
     void receiveProcessError(const QString &message, QProcess::ProcessError error);
 
+private:
+    QStringList genericToolArguments() const;
+
 private:
     bool m_isStopping;
 };