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/languageclient/languageclientsymbolsupport.cpp

@@ -438,7 +438,7 @@ QList<Core::SearchResultItem> generateReplaceItems(const WorkspaceEdit &edits,
     QMap<Utils::FilePath, QList<ItemData>> rangesInDocument;
     auto documentChanges = edits.documentChanges().value_or(QList<TextDocumentEdit>());
     if (!documentChanges.isEmpty()) {
-        for (const TextDocumentEdit &documentChange : qAsConst(documentChanges)) {
+        for (const TextDocumentEdit &documentChange : std::as_const(documentChanges)) {
             rangesInDocument[documentChange.textDocument().uri().toFilePath()] = convertEdits(
                 documentChange.edits());
         }