[PATCH] support: add support_ptr_after_free

[Wilco Dijkstra]

Hi Yury,

> Some tests use pointers after the associated memory has been freed.
> On targets that support memory tagging, using such pointers even
> for test purposes might be impossible. To work around this, we add
> new function that would allow to clear a pointer in a target-specific
> way.

OK with the newline fixed as Andreas pointed out.

Reviewed-by: Wilco Dijkstra  <Wilco.Dijkstra@arm.com>

Cheers,
Wilco