[sv-bc] ballot comment on static reference arguments

There is a ballot comment from Entity-4 on section 11.4.2, concerning
static tasks with reference arguments.  The proposed solution is to
forbid static tasks and functions having reference arguments.  This
indirectly forbids hierarchical references to formal ref arguments.

I wanted to point out that there is a less restrictive solution: directly
forbid hierarchical references to formal ref arguments.

Steven Sharp
sharp@cadence.com