[flang] Update ArrayValueCopy to support array_amend and array_access

This patch update the array value copy pass to support fir-array_amend
and fir.array_access.

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

Reviewed By: PeteSteinfeld, schweitz

Differential Revision: https://reviews.llvm.org/D121300



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