Add missing variable designation, fixes issue #64
Add missing variable designation, fixes issue #64

Newer compilers (GCC 9.2) require loop's upper-bound variable to be
explicitly designated as private/shared/firstprivate/lastprivate

hpcg-benchmark/hpcg,hpcg-benchmark/hpcg,hpcg-benchmark/hpcg,hpcg-benchmark/hpcg,hpcg-benchmark/hpcg,hpcg-benchmark/hpcg