[llvm-bugs] [Bug 123074] clang define `__cpp_pack_indexing` macro in both c++23 mode and c++20 mode

[LLVM Bugs via llvm-bugs]

Issue	123074
Summary	clang define `__cpp_pack_indexing` macro in both c++23 mode and c++20 mode
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Reporter	Arteiimis

    **whitch cause this issue**: https://github.com/fnc12/sqlite_orm/issues/1358

**godbolt**: https://godbolt.org/z/hs1KPfTrj

**screen shot:** 
![Image](https://github.com/user-attachments/assets/c0939cad-a6b2-45f2-a944-5d2e05a6516a)

**iknow clang defines some higher-version test macros even in lower c++ mode , but clang19 dosen't seem to support pack indexing yet still defines `cpp_pack_indexing`...**

**test link**: https://godbolt.org/z/74davPM8c

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