Problem with displaying a matrix with circular reference

```
julia> m = Any[1 2 3]
1×3 Matrix{Any}:
 1  2  3

julia> m[1] = m
1×3 Matrix{Any}:
Error showing value of type Matrix{Any}:
ERROR: StackOverflowError:
```
while a vector works without a problem:
```
julia> m = Any[1, 2, 3]
3-element Vector{Any}:
 1
 2
 3

julia> m[1] = m
3-element Vector{Any}:
  3-element Vector{Any}:#= circular reference @-1 =#
 2
 3
```

CC @ronisbr 