Test cases for incorrect use of directive, clauses and parameters

We need some failed test to verify the error report functions and robustness of the parser. So far the tests are in the following format: 
```
#pragma omp atomic release hint(abc) read acq_rel
PASS: #pragma omp atomic acq_rel release read hint (abc)
```
How about something like this?
```
#pragma omp atomic release hint(abc) read acq_rel write
PASS: some meaningful and valid error msg
```