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/qmljseditor/qmljseditor.cpp

@@ -357,7 +357,7 @@ void QmlJSEditorWidget::updateUses()
     Utils::sort(locations, [](const SourceLocation &lhs, const SourceLocation &rhs) {
         return lhs.begin() < rhs.begin();
     });
-    for (const SourceLocation &loc : qAsConst(locations)) {
+    for (const SourceLocation &loc : std::as_const(locations)) {
         if (! loc.isValid())
             continue;