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

[Petr Penzin via cfe-commits]

ppenzin wrote:

> Hi @ppenzin! Is this core used in many-cores products like wormhole?

This is separate from AI accelerator cores.

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