IRShow: Print arg0 type when necessary to disambiguate `invoke` (#58893)
When invoking any "functor-like", such as a closure:
```julia
bar(x) = @noinline ((y)->x+y)(x)
```
our IR printing was not showing the arg0 invoked, even when it is
required to determine which MethodInstance this is invoking.
Before:
```julia
julia> @code_typed optimize=true bar(1)
CodeInfo(
1 ─ %1 = %new(var"#bar##2#bar##3"{Int64}, x)::var"#bar##2#bar##3"{Int64}
│ %2 = invoke %1(x::Int64)::Int64
└── return %2
) => Int64
```
After:
```julia
julia> @code_typed optimize=true bar(1)
CodeInfo(
1 ─ %1 = %new(var"#bar##2#bar##3"{Int64}, x)::var"#bar##2#bar##3"{Int64}
│ %2 = invoke (%1::var"#bar##2#bar##3"{Int64})(x::Int64)::Int64
└── return %2
) => Int64
```
julia
144de95c - IRShow: Print arg0 type when necessary to disambiguate `invoke` (#58893)
