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

[via llvm-commits]

LiqinWeng wrote:

> I'm in favor of the RISCV part of this patch. The shouldConsiderAddressTypePromotion code is a copy of AArch64. We've had this enabled in our downstream for a couple years.

Have any other questions？Can I merge it？

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