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

[via llvm-commits]

LiqinWeng wrote:

test case form drystone:
```
void test5(int array2[50][50], int a, int b) {
    int loc = a + 5;
    array2[loc][loc] += 1;
    array2[loc + 3][loc] = b;
}
```
The optimization effects are as follows：
![image](https://github.com/user-attachments/assets/8da9920c-d6bf-4368-ab2f-889d3e07d9ea)


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