[OPENMP] Check that allocated variables are used in private clauses.

[OPENMP] Check that allocated variables are used in private clauses.

According to OpenMP 5.0 standard, 2.11.4 allocate Clause, Restrictions,
For any list item that is specified in the allocate clause on a
directive, a data-sharing attribute clause that may create a private
copy of that list item must be specified on the same directive. Patch
adds the checks for this restriction.

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@357390 91177308-0d34-0410-b5e6-96231b3b80d8