dip1000 and preview in combine to cause extra safety errors

[rikki cattermole]

On 14/06/2022 9:23 PM, forkit wrote:
> In yet another example, the argument that 'less instructions are needed 
> to allocate on the heap vs the stack', does not hold up to further 
> scrutiny (at least in this optimised example).

It still holds up.

In both assembly no heap allocations took place. The compiler optimized 
it down to a register.