[llvm] [SLP]Cost fused fmul and fadd as fmuladd in runtime checks bound (PR #228066)

[Alexey Bataev via llvm-commits]

https://github.com/alexey-bataev created https://github.com/llvm/llvm-project/pull/228066

Price a contractable fmul and its fadd/fsub user as one fmuladd in the
scalar cost, so fast-math blocks get the same bound as the fmuladd form.


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