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/cppcheck/cppchecktool.cpp

@@ -194,7 +194,7 @@ void CppcheckTool::check(const Utils::FilePaths &files)
     }
 
     std::map<CppEditor::ProjectPart::ConstPtr, Utils::FilePaths> groups;
-    for (const Utils::FilePath &file : qAsConst(filtered)) {
+    for (const Utils::FilePath &file : std::as_const(filtered)) {
         const QString stringed = file.toString();
         for (const CppEditor::ProjectPart::ConstPtr &part : parts) {
             using CppEditor::ProjectFile;