[clang] [llvm] [RISCV] Add Spacemit X100 processor definition (PR #173988)

[Mark Zhuang via cfe-commits]

zqb-all wrote:

> Reading https://www.spacemit.com/en/news/spacemit-makes-important-breakthroughs-in-risc-v-high-performance-cores/, it sounds like the X100 should enable some of the fusion tuning flags.

Yes, there are some Fusions, but they don't quite match what is currently supported in LLVM. Therefore, I cannot simply add flags to enable them. I plan to submit the support for Fusion in another PR.


https://github.com/llvm/llvm-project/pull/173988