[Bug middle-end/68339] g++.dg/vect/simd-clone-2.cc ICEs with aggressive GC settings and OpenMP

[jakub at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=68339

--- Comment #1 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
Created attachment 36781
  --> https://gcc.gnu.org/bugzilla/attachment.cgi?id=36781&action=edit
gcc6-pr68339.patch

Untested fix.