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

[Sushant Gokhale via llvm-commits]

sushgokh wrote:

> Can you look at fixing what is wrong with the testing?

Check was missing. Fixed it. 

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