[clang] [CIR][AArch64] Upstream vset_lane_*/vsetq_lane_* NEON builtins (PR #186623)

[Andrzej Warzyński via cfe-commits]

banach-space wrote:

Closing this due to inactivity. 

@abhijeetsharma200 , feel free to re-open if you plan to return to this. However, I would really appreciate quick resolution - we are behind and if I don't hear back today/tomorrow, I will re-assign this.

Many thanks for contributing!

https://github.com/llvm/llvm-project/pull/186623