[clang] [llvm] [RISCV] Add TT-Ascalon-d8 processor (PR #115100)

[Philip Reames via cfe-commits]

preames wrote:

I am not sue about the acceptance of the "tt" naming here given we use full names for all other vendors in this context.  Can you raise that point specifically at the next RISCV sync up call for discussion?  

https://github.com/llvm/llvm-project/pull/115100