* Update cl_khr_extended_async_copies tests to the latest version of the extension
Update the 2D and 3D extended async copies tests. Previously they were based on
an older provisional version of the extension.
Also update the variable names to only use 'stride' to refer to the actual
stride values. Previously the tests used 'stride' to refer to the end of one
line or plane and the start of the next. This is not the commonly understood
meaning.
* Address cl_khr_extended_async_copies PR feedback
* Remove unnecessary parenthesis in kernel code
* Make variables `const` and rearrange so that we can reuse
variables, rather than repeating expressions.
* Add in missing vector size of 3 for 2D tests
* Use C++ String literals for kernel code
Rather than C strings use C++11 string literals to define the
kernel code in the extended async-copy tests. Doing this makes
the kernel code more readable.
Co-authored-by: Ewan Crawford <ewan@codeplay.com>
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