[PATCH] D157246: [clang-tidy] Update tests to include C++23 and C++26

[Adrian Vogelsgesang via Phabricator via cfe-commits]

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This commit changes the `c++xx-or-later` definitions to also include
C++23 and the upcoming C++26.
`readability/container-contains.cpp` to also test newer C++ versions.

Also, this commit adjusts a couple of test cases slightly:

- `container-contains.cpp` now also tests newer C++ versions. Restricting it to C++20 was an oversight of mine when originally writing this check.
- `unconventional-assign-operator.cpp`: The `return rhs` raised a "non-const lvalue reference to type 'BadReturnStatement' cannot bind to a temporary" error in C++23. The issue is circumenvented by writing `return *&rhs`.
- `const-correctness-values.cpp` was also running into the same error in C++23. The troublesome test cases were moved to a separate file.


Repository:
  rG LLVM Github Monorepo

https://reviews.llvm.org/D157246

Files:
  clang-tools-extra/test/clang-tidy/check_clang_tidy.py
  clang-tools-extra/test/clang-tidy/checkers/misc/const-correctness-values-before-cxx23.cpp
  clang-tools-extra/test/clang-tidy/checkers/misc/const-correctness-values.cpp
  clang-tools-extra/test/clang-tidy/checkers/misc/unconventional-assign-operator.cpp
  clang-tools-extra/test/clang-tidy/checkers/readability/container-contains.cpp

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