[Bug c++/70615] [6 Regression] ICE on valid code at -O1 and above on x86_64-linux-gnu in add_expr, at tree.c:7870

[jakub at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=70615

--- Comment #3 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
cp_gimplify_expr has code to handle the PTRMEM_CST case, but that is
unfortunately too late, if it appears in a CONSTRUCTOR, the gimplifier can try
to hash the CONSTRUCTOR which obviously can't handle the FE specific trees.

So, shall the FE somewhere early remove the PTRMEM_CSTs, or shall
cp_genericize_r remove them (well, replace with cplus_expand_constant result),
or shall cp_gimplify_expr have a case for CONSTRUCTOR where it would walk_tree
the ctor and use cplus_expand_constant in there?