[llvm] [RISCV] Add short forward branch scheduling for Andes45 (PR #147890)

[Jim Lin via llvm-commits]

tclin914 wrote:

> could you also add a simple MCA test if that's not a lot of work?

I don't know how to add an MCA test to verify the scheduling info used by pseudo instructions (PseudoCC* in this case) :(

https://github.com/llvm/llvm-project/pull/147890