[Bug target/82524] [7/8 Regression] expensive-optimizations produces wrong results

[jakub at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=82524

--- Comment #15 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
Created attachment 42347
  --> https://gcc.gnu.org/bugzilla/attachment.cgi?id=42347&action=edit
gcc8-pr82524.patch

Nothing really needs to be XFAILed (well, haven't done full bootstrap/regtest
yet, but pr78904* works; thanks for the tip, I was already in the middle of
writing pretty much equivalent test).