[OPENMP] Initial support for 'ordered' clause.


git-svn-id: http://llvm.org/svn/llvm-project/cfe/trunk@211347 91177308-0d34-0410-b5e6-96231b3b80d8
OMPScheduleClause::OMPScheduleClause(): Fix possible typos, s/\brief/\param/g. [-Wdocumentation]

git-svn-id: http://llvm.org/svn/llvm-project/cfe/trunk@211348 91177308-0d34-0410-b5e6-96231b3b80d8