Intel: Uninitialized SVM memory is not supported

Intel is one of the few platforms that also supports IL execution, however something seems wrong:

```julia
using OpenCL

cl.platform!("intel")

function memset(a, val)
@inbounds a[1] = val
return
end

function main()
a = CLArray{Int}(undef, 1)
@opencl memset(a, 42)
Array(a)
end
```

```julia-repl
julia> main()
1-element Vector{Int64}:
42

julia> main()
1-element Vector{Int64}:
0

julia> main()
1-element Vector{Int64}:
0
```

Not sure yet what the issue is here.