[Bug c++/89285] [8/9 Regression] ICE after casting the this pointer in the constructor in C++17 mode

[jakub at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=89285

--- Comment #11 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
Created attachment 45667
  --> https://gcc.gnu.org/bugzilla/attachment.cgi?id=45667&action=edit
gcc9-pr89285-wip.patch

Updated patch to address 1).  For 2), I guess we need to handle e.g.
CLEANUP_STMT, IF_STMT, FOR_STMT, WHILE_STMT, DO_STMT, SWITCH_STMT,
CONTINUE_STMT, BREAK_STMT in cxx_eval_constant_expression.