xe: ocl: add inline load

[rjoursler]

Adds a new load function overload to remove the need for variable pre-declaration before loading. In addition, refactors a few reference kernels (ref_bnorm, ref_eltwise, ref_lrn) to use ocl_io.h to demonstrate the utility.

[Simonsays095]

Nice, I didn't think we were this close to being able to get rid of type punning in our ocl kernels. What are the remaining roadblocks for the other kernels? I know there are issues with vector operations (not yet supported on the custom types), and I think the dispatcher has some constraints?

[rjoursler]

What are the remaining roadblocks for the other kernels? I know there are issues with vector operations (not yet supported on the custom types), and I think the dispatcher has some constraints?

I messed around with that some as well, check out the branch rjoursle/block_load to see the results. To my knowledge, after we have add a block_load() function to ocl_io.h, it is mostly a matter of refactoring kernels to use that interface.

[rjoursler]

make test
disable test_device_cpu
enable test_device_gpu