[Bug bootstrap/63235] building fails with --disable-bootstrap

[andi-gcc at firstfloor dot org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=63235

--- Comment #10 from Andi Kleen <andi-gcc at firstfloor dot org> ---
Ok fair enough.

Can do the runtime check in the else of the ifdef then.

Then at least x86_64 or 32bit with SSE would work.