[llvm] [RISCV] Match prefetch address with offset (PR #66072)

[Craig Topper via llvm-commits]

https://github.com/topperc commented:

I think I would rather see a SelectAddr function for prefetch that handles just the cases that are really tested. You can move parts of SelectAddrRegImm into functions to reuse them if needed, but don't try to make SelectAddrRegImm handle both cases.

https://github.com/llvm/llvm-project/pull/66072