[llvm] [RISCV][TTI] Implement getAddressComputationCost() in RISCV TTI. (PR #149955)

[Elvis Wang via llvm-commits]

https://github.com/ElvisWang123 commented:

Base on updating `VPWidenMemoryRecipe::computeCost()` in LV #150371.

`vectorie-force-tail-with-evl-gather-scatter` looks like won't be vectorized since the cost of gather/scatter increase.

https://github.com/llvm/llvm-project/pull/149955