QStringList: add move ctor from QList<QString>

Change-Id: I93fe4656c1a608ccc828bd9db528d4597a22f070
Reviewed-by: Jędrzej Nowacki <jedrzej.nowacki@digia.com>
Reviewed-by: Thiago Macieira <thiago.macieira@intel.com>

src/corelib/tools/qstringlist.cpp

@@ -203,6 +203,16 @@ QT_BEGIN_NAMESPACE
     \sa operator=()
 */
 
+/*!
+    \fn QStringList::QStringList(QList<QString> &&other)
+    \overload
+    \since 5.4
+
+    Move-constructs from QList<QString>.
+
+    After a successful construction, \a other will be empty.
+*/
+
 /*!
     \fn QStringList &QStringList::operator=(const QList<QString> &other)
     \since 5.4

src/corelib/tools/qstringlist.h

@@ -64,6 +64,9 @@ public:
     inline QStringList() { }
     inline explicit QStringList(const QString &i) { append(i); }
     inline QStringList(const QList<QString> &l) : QList<QString>(l) { }
+#ifdef Q_COMPILER_RVALUE_REFS
+    inline QStringList(QList<QString> &&l) : QList<QString>(std::move(l)) { }
+#endif
 #ifdef Q_COMPILER_INITIALIZER_LISTS
     inline QStringList(std::initializer_list<QString> args) : QList<QString>(args) { }
 #endif