[OPENMP] Initial codegen for '#pragma omp parallel'


git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@208077 91177308-0d34-0410-b5e6-96231b3b80d8
[OPENMP] Temporary disable test for parallel codegen


git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@208078 91177308-0d34-0410-b5e6-96231b3b80d8