[clang] [CIR][AArch64] Lower FP16 vduph lane intrinsics (PR #186955)

[Andrzej Warzyński via cfe-commits]

banach-space wrote:

@neonetizen , I am happy to land this for you, but you will need to update your GitHub settings. ATM, according to GitHub:
> This commit will be authored by 102492275+neonetizen at users.noreply.github.com.102492275+neonetizen@users.noreply.github.com.

Please note LLVM's docs: https://llvm.org/docs/GitHub.html#before-your-first-pr

https://github.com/llvm/llvm-project/pull/186955