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

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LiqinWeng wrote:

> Can you add a description and what can we gain from this patch?
![image](https://github.com/user-attachments/assets/873d4875-4be5-4f7b-a773-809f405fcc4d)
This optimization helps reduce repeated calculations of base addresses by extracting type extensions when the same base address is accessed multiple times but its offset is a constant. So I added this API implementation for RISCV

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