[clang] [CIR][AArch64] Upstream vrshrd_n_s64/u64 and vrshr_n_v vector rounding shift right (PR #185992)

[Md Mouzam Arfi Hussain via cfe-commits]

ArfiH wrote:

@banach-space 
Hi, I'm having trouble resolving the merge conflicts.
Would you be able to help or provide guidance? Thank you for your patience!


https://github.com/llvm/llvm-project/pull/185992