[clang] [llvm] Revert "Revert "[SVE2.1][Clang][LLVM]Add BFloat16 builtin in Clang an… (PR #73110)

[David Spickett via cfe-commits]

https://github.com/DavidSpickett approved this pull request.

LGTM, thank you for the fix!

You'll know within ~15 minutes of landing whether there is still an issue, but I doubt there will be.

https://github.com/llvm/llvm-project/pull/73110