[clang] [llvm] [RISCV] Add processor definition for SpacemiT-X60 (PR #94564)

[Yangyu Chen via llvm-commits]

cyyself wrote:

I have a question: SpacemiT-X60 does not support Zicclsm on Vector, which is the same as K230, as discussed in #88029 . Is the Zicclsm safe here?

https://github.com/llvm/llvm-project/pull/94564