[llvm] [AArch64] Consider [u/s]itofp SVE packing costs (PR #225352)

[Jack Styles via llvm-commits]

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Stylie777 wrote:

In Hindsight, it does not as the unpacking is to enable the original scalable datatype to transform to the dst scalable type. 

https://github.com/llvm/llvm-project/pull/225352