[Bug testsuite/92391] gcc.dg/vect/bb-slp-40.c FAILs

[joel.hutton at arm dot com]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=92391

--- Comment #2 from Joel Hutton <joel.hutton at arm dot com> ---
As this fails when it was introduced, and I don't have a SPARC machine to test
on, I suggest making this XFAIL on sparc.