[llvm] [SLP]Support copyable fmuls in fmuladd, modeled as fmuladd(a, b, -0.0) (PR #213369)

[Alexey Bataev via llvm-commits]

alexey-bataev wrote:

> Hello. It looks like this is still failing: https://godbolt.org/z/n73zeMGTr

Hi, must be fixed

https://github.com/llvm/llvm-project/pull/213369