Add tests for cl_ext_immutable_memory_objects

[MichaelRizkalla-arm]

This change provides partial test coverage for KhronosGroup/OpenCL-Docs#1280

Adding CTS tests for:

1. clEnqueueMapBuffer, clEnqueueMapImage.
2. Command buffer negative tests.
3. clSetKernelArgs negative tests.

The bulk of the tests is to make sure that the CL driver does not allow writing to a memory object that is created with CL_MEM_IMMUTABLE_EXT flag when used with the above APIs.

[bashbaug]

Looks like this is another one where we'll need header changes before we can merge.

Would it be possible to get a draft headers PR up with these changes so this won't become a bottleneck once the tests have been reviewed?

[MichaelRizkalla-arm]

Thanks for the review.

There is a plan to add more tests to cover command queue's fills and copies and reading from buffers and images.

[kpet]

Here's a PR adding definitions to the headers: https://github.com/KhronosGroup/OpenCL-Headers/pull/274

[bashbaug]

Please re-add "focused review" once the merge conflicts are resolved.

[kpet]

@MichaelRizkalla-arm Could you resolve the merge conflicts please?

[MichaelRizkalla-arm]

I have updated the PR to resolve the merge conflicts.

[bashbaug]

Merging as discussed in the June 17th memory subgroup.