Flang is manually mangling names for memset/memcpy/memmove
intrinsics, so we need to update the mangling to use the opaque
pointer format (p0 instead of p0i8).
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>