[llvm] [AArch64][CostModel] Model sve costs for ctpop (PR #192428)

[Yashwant Singh via llvm-commits]

================

----------------
yashssh wrote:

For i8 direct lowering to`cnt` exists, won't it be misleading to add cost here? https://godbolt.org/z/8r5PoeY7f



https://github.com/llvm/llvm-project/pull/192428