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

[Craig Topper via llvm-commits]

topperc wrote:

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

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