[llvm] [AArch64][GlobalISel] Improve non-SVE popcount for 32bit and 64 bit using udot (PR #96409)

[David Green via llvm-commits]

https://github.com/davemgreen commented:

Sounds good, thanks. Can we add global-isel run lines to the existing tests?

https://github.com/llvm/llvm-project/pull/96409