[llvm] [RISCV] Implement RISCVTTIImpl::shouldConsiderAddressTypePromotion for RISCV (PR #102560)

[via llvm-commits]

LiqinWeng wrote:

> Why are there InstCombine changes in this patch?

I removed the optimization I had implemented in instcombine. I think that when the offset in the address calculation is a constant, it can be covered in the current patch and does not need to be implemented in InstCombine.
![image](https://github.com/user-attachments/assets/3a42f5d2-b714-4d4b-ac33-dfd7663b023c)


https://github.com/llvm/llvm-project/pull/102560