[OpenMP] add more tests for 'distribute simd' pragma

This patch is to add two additional tests for testing 'distribute simd' pragma with disallowed clauses and loops.

Differential Revision: http://reviews.llvm.org/D22176


git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@275306 91177308-0d34-0410-b5e6-96231b3b80d8