[flang][NFC] Add pointer dummy arguments tests

This patch adds test for calls with POINTER dummy arguments on the caller side.

It also fixes some formatting error that was introduced when upstreaming
the other pointer tests.

This patch is part of the upstreaming effort from fir-dev branch.

Reviewed By: PeteSteinfeld

Differential Revision: https://reviews.llvm.org/D122238



Co-authored-by: Jean Perier <jperier@nvidia.com>