[Bug middle-end/91866] Sign extend of an int is not recognized

[glisse at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=91866

--- Comment #1 from Marc Glisse <glisse at gcc dot gnu.org> ---
See https://gcc.gnu.org/ml/gcc-patches/2019-08/msg00821.html