doc: Correct clang parsing errors in qvariant.h

Some old uses of Q_QDOC to prevent the old qdoc C++ parser
from seeing declarations it didn't need to see were preventing
clang from seeing declarations it did need to see. These have
been removed, and some internal documentation has been added to
account for some declarations that suddenly became public but
should not be seen in the Qt API.

Change-Id: Iccf423e5cf8767f0a271150ab59bea54cf90ac46
Reviewed-by: Topi Reiniö <topi.reinio@qt.io>

src/corelib/kernel/qmetatype.cpp

@@ -216,6 +216,7 @@ struct DefinedTypesFilter {
     \value QChar QChar
     \value QString QString
     \value QByteArray QByteArray
+    \value Nullptr \c{std::nullptr_t}
 
     \value VoidStar \c{void *}
     \value Long \c{long}
@@ -287,6 +288,8 @@ struct DefinedTypesFilter {
 
     \value User  Base value for user types
     \value UnknownType This is an invalid type id. It is returned from QMetaType for types that are not registered
+    \omitvalue LastCoreType
+    \omitvalue LastGuiType
 
     Additional types can be registered using Q_DECLARE_METATYPE().
 

src/corelib/kernel/qmetatype.h

@@ -441,6 +441,7 @@ public:
         QJsonValue = 45, QJsonObject = 46, QJsonArray = 47, QJsonDocument = 48,
         QByteArrayList = 49, QObjectStar = 39, SChar = 40,
         Void = 43,
+        Nullptr = 51,
         QVariantMap = 8, QVariantList = 9, QVariantHash = 28,
         QFont = 64, QPixmap = 65, QBrush = 66, QColor = 67, QPalette = 68,
         QIcon = 69, QImage = 70, QPolygon = 71, QRegion = 72, QBitmap = 73,
@@ -448,6 +449,8 @@ public:
         QMatrix = 79, QTransform = 80, QMatrix4x4 = 81, QVector2D = 82,
         QVector3D = 83, QVector4D = 84, QQuaternion = 85, QPolygonF = 86,
         QSizePolicy = 121,
+        LastCoreType = Nullptr,
+        LastGuiType = QPolygonF,
         User = 1024
     };
 #endif

src/corelib/kernel/qvariant.cpp

@@ -3999,6 +3999,41 @@ QDebug operator<<(QDebug dbg, const QVariant::Type p)
     \typedef QVariant::DataPtr
     \internal
 */
+/*! \typedef QVariant::f_construct
+  \internal
+*/
+
+/*! \typedef QVariant::f_clear
+  \internal
+*/
+
+/*! \typedef QVariant::f_null
+  \internal
+*/
+
+/*! \typedef QVariant::f_load
+  \internal
+*/
+
+/*! \typedef QVariant::f_save
+  \internal
+*/
+
+/*! \typedef QVariant::f_compare
+  \internal
+*/
+
+/*! \typedef QVariant::f_convert
+  \internal
+*/
+
+/*! \typedef QVariant::f_canConvert
+  \internal
+*/
+
+/*! \typedef QVariant::f_debugStream
+  \internal
+*/
 
 /*!
     \fn DataPtr &QVariant::data_ptr()

src/corelib/kernel/qvariant.h

@@ -360,7 +360,6 @@ class Q_CORE_EXPORT QVariant
     { return canConvert(qMetaTypeId<T>()); }
 
  public:
-#ifndef Q_QDOC
     struct PrivateShared
     {
         inline PrivateShared(void *v) : ptr(v), ref(1) { }
@@ -431,7 +430,6 @@ class Q_CORE_EXPORT QVariant
         f_canConvert canConvert;
         f_debugStream debugStream;
     };
-#endif
 
     inline bool operator==(const QVariant &v) const
     { return cmp(v); }