[Bug testsuite/86766] new test case c-c++-common/spec-barrier-1.c introduced in r263168 fails

[rguenth at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=86766

--- Comment #1 from Richard Biener <rguenth at gcc dot gnu.org> ---
I think the failure was desired so you fixup your target