[Bug rtl-optimization/63259] Detecting byteswap sequence

[thopre01 at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=63259

--- Comment #4 from thopre01 at gcc dot gnu.org ---
I detect no noticeable difference when bootstrapping gcc with or without the
patch so I think we're in for a fix. :-)