[llvm] [WIP] - [LLVM][SVE] Honour NEON calling convention when targeting SVE VLS. (PR #70847)

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vfdff wrote:

hi @paulwalker-arm , If we still prefer the `NEON` regitster, can we just ignore to addRegisterClass for these fix registers, whose vector length is bigger than 128-bit?  https://github.com/llvm/llvm-project/blob/00165653212757733dd3dce01d1ba02319adcf2b/llvm/lib/Target/AArch64/AArch64ISelLowering.cpp#L413

https://github.com/llvm/llvm-project/pull/70847