[llvm] Revert "[AArch64] Improve lowering of truncating uzp1" (PR #85115)

[Usman Nadeem via llvm-commits]

UsmanNadeem wrote:

I fixed the tests already, in https://github.com/llvm/llvm-project/commit/79cd2c0bb9acb4685094d6b3bf21c758aa51d3df so a revert shouldn't be needed.

https://github.com/llvm/llvm-project/pull/85115