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

[via llvm-commits]

LiqinWeng wrote:

> Rejecting the InstCombine changes, no comment on the rest.

I restored the optimization of instcombine.

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