[llvm] [CostModel][AArch64] Make extractelement, with fmul user, free whenev… (PR #111479)

[David Green via llvm-commits]

https://github.com/davemgreen commented:

Thanks. High level comment - this sounds OK and I don't know of a better way to get the same result. If @alexey-bataev doesn't disagree about the SLP parts and we can clean up the AArch64 code a little then this seem OK to me.

https://github.com/llvm/llvm-project/pull/111479