[clang] [llvm] [RISCV] Add Hazard3 CPU (PR #102452)

[Sam Elliott via cfe-commits]

lenary wrote:

I've updated this and gone with `rp2350-hazard3` as that's the prevailing consensus.

This is stacked on #104601 because i got fed up with the invalid cpu note tests. Otherwise it's ready to review.

https://github.com/llvm/llvm-project/pull/102452