[Bug bootstrap/81315] powerpc64 vs building lang/gcc7-devel (on FreeBSD head): xgcc gets segmentation fault

[segher at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=81315

--- Comment #5 from Segher Boessenkool <segher at gcc dot gnu.org> ---
This was BE, on a compiler that defaults to power4 ("970 without altivec").
I.e. the default for powerpc64-linux.