[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 #16 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
The above commit just brings 9.x into the similar state as 8.x on this
testcase, thus it is ice-on-valid.