[Bug tree-optimization/106513] bswap is incorrectly generated

[schwab@linux-m68k.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=106513

--- Comment #1 from Andreas Schwab <schwab@linux-m68k.org> ---
This subexpression has undefined behaviour: (((int64_t) 0xff) << 56).