[clang] [Clang] Added check for unexpanded pack in attribute [[assume]] (PR #91893)

[Azmat Yusuf via cfe-commits]

azmat-y wrote:

Here are the builds

Mentioned in emails
[clang-aarch64-sve-vls](https://lab.llvm.org/buildbot/#/builders/184/builds/12514)
[clang-aarch64-sve-vla-2stage](https://lab.llvm.org/buildbot/#/builders/198/builds/9849)

Others
[arc-builder](https://lab.llvm.org/buildbot/#/builders/164/builds/52197)
[bolt-x86_64-ubuntu-clang](https://lab.llvm.org/buildbot/#/builders/252/builds/9890)
[clang-with-lto-ubuntu](https://lab.llvm.org/buildbot/#/builders/124/builds/10736)
[clang-with-thin-lto-ubuntu](https://lab.llvm.org/buildbot/#/builders/67/builds/15879)
[clang-x64-windows-msvc](https://lab.llvm.org/buildbot/#/builders/123/builds/26469)
[lldb-aarch64-windows](https://lab.llvm.org/buildbot/#/builders/219/builds/11350)



https://github.com/llvm/llvm-project/pull/91893