[llvm] [AArch64] Change the cost of fma and fmuladd to match fmul. (PR #152963)

[Ricardo Jesus via llvm-commits]

rj-jesus wrote:

Hi @davemgreen, this appears to have caused a ~10% regression in a loop like this: https://godbolt.org/z/Toj6EG3Mx.

Have you found anything similar on your end?

https://github.com/llvm/llvm-project/pull/152963