Port from qAsConst() to std::as_const()

We've been requiring C++17 since Qt 6.0, and our qAsConst use finally
starts to bother us (QTBUG-99313), so time to port away from it
now.

Since qAsConst has exactly the same semantics as std::as_const (down
to rvalue treatment, constexpr'ness and noexcept'ness), there's really
nothing more to it than a global search-and-replace.

Task-number: QTBUG-99313
Change-Id: I88edd91395849574436299b8badda21bb93bea39
Reviewed-by: hjk <hjk@qt.io>

src/plugins/projectexplorer/extracompiler.cpp

@@ -263,7 +263,7 @@ void ExtraCompilerPrivate::updateIssues()
 
     QList<QTextEdit::ExtraSelection> selections;
     const QTextDocument *document = widget->document();
-    for (const Task &issue : qAsConst(issues)) {
+    for (const Task &issue : std::as_const(issues)) {
         QTextEdit::ExtraSelection selection;
         QTextCursor cursor(document->findBlockByNumber(issue.line - 1));
         cursor.movePosition(QTextCursor::StartOfLine);