QShader: add move constructor, move-assignment operator and swap

[ChangeLog][QtGui][QShader] Added move constructor, move-assignment
operator and swap member function.

Change-Id: I25dbaf4cdd1190204d23121e6ecd8e3947c4b612
Reviewed-by: Marc Mutz <marc.mutz@qt.io>
(cherry picked from commit 89d89f99a794d8edf9282e76a95f78c28ab4d932)
Reviewed-by: Qt Cherry-pick Bot <cherrypick_bot@qt-project.org>

src/gui/rhi/qshader.cpp

@@ -298,6 +298,28 @@ QShader &QShader::operator=(const QShader &other)
     return *this;
 }
 
+/*!
+    \fn QShader::QShader(QShader &&other) noexcept
+    \since 6.7
+
+    Move-constructs a new QShader from \a other.
+
+    \note The moved-from object \a other is placed in a
+    partially-formed state, in which the only valid operations are
+    destruction and assignment of a new value.
+*/
+
+/*!
+    \fn QShader &QShader::operator=(QShader &&other)
+    \since 6.7
+
+    Move-assigns \a other to this QShader instance.
+
+    \note The moved-from object \a other is placed in a
+    partially-formed state, in which the only valid operations are
+    destruction and assignment of a new value.
+*/
+
 /*!
     Destructor.
  */
@@ -307,6 +329,14 @@ QShader::~QShader()
         delete d;
 }
 
+/*!
+    \fn void QShader::swap(QShader &other)
+    \since 6.7
+
+    Swaps shader \a other with this shader. This operation is very fast and
+    never fails.
+*/
+
 /*!
     \return true if the QShader contains at least one shader version.
  */

src/gui/rhi/qshader.h

@@ -117,7 +117,11 @@ public:
     QShader();
     QShader(const QShader &other);
     QShader &operator=(const QShader &other);
+    QShader(QShader &&other) noexcept : d(std::exchange(other.d, nullptr)) {}
+    QT_MOVE_ASSIGNMENT_OPERATOR_IMPL_VIA_PURE_SWAP(QShader)
     ~QShader();
+
+    void swap(QShader &other) noexcept { qt_ptr_swap(d, other.d); }
     void detach();
 
     bool isValid() const;