[Bug middle-end/93505] [8/9/10 Regression] wrong code or ICE with __builtin_bswap64() and rotation at -Og

[jakub at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=93505

--- Comment #10 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
Created attachment 47740
  --> https://gcc.gnu.org/bugzilla/attachment.cgi?id=47740&action=edit
gcc10-pr93505.patch

Untested combiner fix.  IMHO even when we fix expand_binop we want it anyway,
because we don't want to invoke UB in the compiler, even on UB in the testcase.