[Bug testsuite/70595] Cilk Plus testsuite needs massive cleanup

[ro at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=70595

--- Comment #1 from Rainer Orth <ro at gcc dot gnu.org> ---
Created attachment 38219
  --> https://gcc.gnu.org/bugzilla/attachment.cgi?id=38219&action=edit
Initial patch