QTextDocumentPrivate: de-inline {add,remove}Cursor()

In a 'ninja qtdeclarative' build, the addCursor() function alone is
compiled 458x for a total of almost 10s cumulative compilation time.

This makes it one of the top-20 template instantiations in a Clang
-ftime-trace build.

The removeCursor() function doesn't show up quite as much, but
de-inline, too, while we're at it.

Pick-to: 6.5
Task-number: QTBUG-97601
Change-Id: I37b920a8b364861efab78f736d71642dc82d8982
Reviewed-by: Thiago Macieira <thiago.macieira@intel.com>

src/gui/text/qtextdocument_p.cpp

@@ -1419,6 +1419,16 @@ QTextFrame *QTextDocumentPrivate::rootFrame() const
     return rtFrame;
 }
 
+void QTextDocumentPrivate::addCursor(QTextCursorPrivate *c)
+{
+    cursors.insert(c);
+}
+
+void QTextDocumentPrivate::removeCursor(QTextCursorPrivate *c)
+{
+    cursors.remove(c);
+}
+
 QTextFrame *QTextDocumentPrivate::frameAt(int pos) const
 {
     QTextFrame *f = rootFrame();

src/gui/text/qtextdocument_p.h

@@ -243,8 +243,8 @@ private:
 public:
     void documentChange(int from, int length);
 
-    inline void addCursor(QTextCursorPrivate *c) { cursors.insert(c); }
-    inline void removeCursor(QTextCursorPrivate *c) { cursors.remove(c); }
+    void addCursor(QTextCursorPrivate *c);
+    void removeCursor(QTextCursorPrivate *c);
 
     QTextFrame *frameAt(int pos) const;
     QTextFrame *rootFrame() const;