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

[Jim Lin via llvm-commits]

tclin914 wrote:

I've summarized the issue in [#144639](https://github.com/llvm/llvm-project/issues/144639).

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