[clang] [CIR][AArch64] Lower NEON zip1/2 elements intrinsics (PR #194311)

[Andrzej Warzyński via cfe-commits]

banach-space wrote:

> @banach-space Hi, could you help me merge this PR first?

While reviewing https://github.com/llvm/llvm-project/pull/193658 I realised that we should move tests for `zip`/`unzip` to a dedicated file, e.g. "test/CodeGen/AArch64/neon/perm.c". Apologies for the sudden change, but could you implement this change before merging this? Thank you!

https://github.com/llvm/llvm-project/pull/194311