[Bug rtl-optimization/68991] -O3 generates misaligned xorv4si3

[hjl.tools at gmail dot com]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=68991

--- Comment #4 from H.J. Lu <hjl.tools at gmail dot com> ---
Also

subreg:V4SI (reg:TI 247 [ MEM[(const struct bitset &)FeatureEntry_115 + 8] ])
0)