[Bug c/128595] convert_for_assignment transparent_union path strips array types via TREE_TYPE without preserving element qualifiers, silently dropping const/volatile on pointer-to-array arguments

[pinskia at gcc dot gnu.org via Gcc-bugs]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=128595

--- Comment #1 from Drea Pinski <pinskia at gcc dot gnu.org> ---
transparent_union was not designed for this usage.  It is only kept around for
legacy reasons.