10.0^68 gives a different result on nightly vs 1.11 after llvm-muladd pass removal

Master:

```
julia> 10.0^68
1.0000000000000001e68
```

1.11:

```
julia> 10.0^68
1.0e68
```


https://github.com/JuliaLang/julia/pull/55802 changed stuff related to `muladd` which `pow` uses at

https://github.com/JuliaLang/julia/blob/2a06376c18afd7ec875335070743dcebcd85dee7/base/math.jl#L1206

Putting on milestone so it isn't forgotten, not to say it is a regression (I don't know).