Added negative tests for function CreateCommandBufferKHR from cl_khr_command_buffer

[kamil-goras-mobica]

According to description #1668

[CLAassistant]

All committers have signed the CLA.

[bashbaug]

These tests generally look good and they found an issue in the command buffer emulation layer (already fixed), so that's pretty cool.

Did we discuss whether to implement these tests in a separate executable or as a part of the existing command buffer executable? All else being equal I'd prefer to minimize the number of test executables, and I don't think we've had separate executables for negative tests previously.

[EwanC]

Did we discuss whether to implement these tests in a separate executable or as a part of the existing command buffer executable? All else being equal I'd prefer to minimize the number of test executables, and I don't think we've had separate executables for negative tests previously.

I don't think we have discussed it. I would probably also err on the side of less test executables as I feel like new ones could get missed when people are maintain scripts/csvs for testing, but that's a slight preference rather than a strong one. Prefixing the new tests with negative_ I think would suitably identify the negative tests in the existing cl_khr_command_buffer executable.

[bashbaug]

Merging as discussed in the April 16th teleconference.