[llvm] [WebAssembly] Lower fmuladd to madd and nmadd (PR #161355)

[Derek Schuff via llvm-commits]

https://github.com/dschuff approved this pull request.

Thanks, this looks good.
On FP16 it's good to get this baseline. I think it probably makes sense to defer further optimization work until we get the proposal to phase 2 and have a better idea of exactly which operations it will include (unless we want to do more benchmarking work to inform that decision of course).

https://github.com/llvm/llvm-project/pull/161355