[Reland] "[RISCV][TTI] Implement getAddressComputationCost() in RISCV TTI. #149955" (#156386) This patch implements the `getAddressComputationCost()` in RISCV TTI which make the gather/scatter with address calculation more expansive that stride cost. Note that the only user of `getAddressComputationCost()` with vector type is in `VPWidenMemoryRecipe::computeCost()`. So this patch make some LV tests changes. I've checked the tests changes in LV and seems those changes can be divided into two groups. * gather/scatter with uniform vector ptr, seems can be optimized to masked.load. * can optimize to stride load/store. ---- After #155739 landed, the assertion (cost mis-aligned) is fixed. I've tested llvm-test-suite w/ rva23u64 and rva23u64_zvl1024b locally and no assertion occurred.
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