[VPlan] Get Addr computation cost with scalar type if it is uniform for gather/scatter. (NFC) (#150371) This patch query `getAddressComputationCost()` with scalar type if the address is uniform. This can help the cost for gather/scatter more accurate. In current LV, non consecutive VPWidenMemoryRecipe (gather/scatter) will account the cost of address computation. But there are some cases that the address is uniform across all lanes, that makes the address can be calculated with scalar type and broadcast. I have a followup optimization that tries to convert gather/scatter with uniform memory access to scalar load/store + broadcast (and select if needed). With this optimization, we can remove this temporary change. This patch is preparation for #149955 to prevent regressions.
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