JuliaLang / julia / #37071

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IRShow: use `IOContext` for `PhiNodes`/`:invoke` printing (#43226)

In order to allow `Argument`s to be printed nicely.

> before
```julia
julia> code_typed((Float64,)) do x
           sin(x)
       end
1-element Vector{Any}:
 CodeInfo(
1 ─ %1 = invoke Main.sin(_2::Float64)::Float64
└──      return %1
) => Float64

julia> code_typed((Bool,Any,Any)) do c, x, y
           z = c ? x : y
           z
       end
1-element Vector{Any}:
 CodeInfo(
1 ─      goto #3 if not c
2 ─      goto #4
3 ─      nothing::Nothing
4 ┄ %4 = φ (#2 => _3, #3 => _4)::Any
└──      return %4
) => Any
```

> after
```julia
julia> code_typed((Float64,)) do x
           sin(x)
       end
1-element Vector{Any}:
 CodeInfo(
1 ─ %1 = invoke Main.sin(x::Float64)::Float64
└──      return %1
) => Float64

julia> code_typed((Bool,Any,Any)) do c, x, y
           z = c ? x : y
           z
       end
1-element Vector{Any}:
 CodeInfo(
1 ─      goto #3 if not c
2 ─      goto #4
3 ─      nothing::Nothing
4 ┄ %4 = φ (#2 => x, #3 => y)::Any
└──      return %4
) => Any
```

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