[llvm] [AArch64][CostModel] Fix stale costs for "ctpop" Intrinsic (PR #191769)

[Yashwant Singh via llvm-commits]

yashssh wrote:

> Hi - Do you have a particular usecase for lowering the cost, or is this just to align more with the produced codegen?

Latter. To align with the produced codegen.

https://github.com/llvm/llvm-project/pull/191769