[clang] [llvm] Revert "[RISCV] Remove B and Zbc extension from Andes series cpus." (PR #144402)

[Min-Yih Hsu via llvm-commits]

mshockwave wrote:

I also noticed that sometimes patches on CPU definitions somehow wasn't picked up by Clang in some of the CIs (usually ARC and SystemZ, IIRC). Even more confusingly, the SHA printed out from those Clangs showed that patch was correctly applied. Perhaps it was linking an old version of library?

https://github.com/llvm/llvm-project/pull/144402