[llvm] [AArch664] Replace uaddlv with addv for popcount operation (PR #121934)

[David Green via llvm-commits]

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+; NOTE: Assertions have been autogenerated by utils/update_llc_test_checks.py UTC_ARGS: --version 5
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davemgreen wrote:

Do we need these new test files, or could they be combined into one of the existing ctpop tests?

https://github.com/llvm/llvm-project/pull/121934