Prebuilt LLVM 21.1.8 uploaded

[Nathan Chancellor]

Hi all,

I have built and uploaded LLVM 21.1.8 to
https://mirrors.edge.kernel.org/pub/tools/llvm/.

This is expected to be the last 21.x release per the release
announcement:

https://discourse.llvm.org/t/llvm-21-1-8-released/89144

However, if there are any issues found, please let us know via email or
https://github.com/ClangBuiltLinux/linux/issues/new, so that we have an
opportunity to get them fixed in main before the release/22.x branch is
created.

Cheers,
Nathan