[clang] [CIR][AArch64] Implement vget_lane_bf16 and vgetq_lane_bf16 builtins (PR #186866)

[Jiří Filek via cfe-commits]

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fileho wrote:

I think that the order is preserved, it is just diffed in a strange way

https://github.com/llvm/llvm-project/pull/186866