[OPENMP]Fix PR41768: check DSA for globals with `default(none)` clauses.

If the `default(none)` was specified for the construct, we might miss
diagnostic for the globals without explicitly specified data-sharing
attributes. Patch fixes this problem.

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@360061 91177308-0d34-0410-b5e6-96231b3b80d8