[Bug libgomp/81805] Another libgomp.c/for-5.c failure on nvptx -- illegal memory access

[vries at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=81805

--- Comment #6 from Tom de Vries <vries at gcc dot gnu.org> ---
Created attachment 41970
  --> https://gcc.gnu.org/bugzilla/attachment.cgi?id=41970&action=edit
tentative patch for test-case from comment 3