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

[Nikita Popov via llvm-commits]

https://github.com/nikic requested changes to this pull request.

Rejecting the InstComine changes, no comment on the rest.

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