Use the explicit version of the atomic_load/store and atomic_fetch_add
with memory order relaxed and memory scope workgroup to allow devices
that only support the minimum CL_DEVICE_ATOMIC_MEMORY_CAPABILITIES which
are (CL_DEVICE_ATOMIC_ORDER_RELAXED | CL_DEVICE_ATOMIC_SCOPE_WORK_GROUP)
to run the tests.
The test should only require the relaxed ordering and memory scope
workgroup anyway.
From the specificiation:
"The non-explicit atomic_store function requires support for OpenCL C
2.0, or OpenCL C 3.0 or newer and both the
__opencl_c_atomic_order_seq_cst and __opencl_c_atomic_scope_device
features"
"The non-explicit atomic_load function requires support for OpenCL C 2.0
or OpenCL C 3.0 or newer and both the __opencl_c_atomic_order_seq_cst
and __opencl_c_atomic_scope_device features."
"The non-explicit atomic_fetch_key functions require support for OpenCL
C 2.0, or OpenCL C 3.0 or newer and both the
__opencl_c_atomic_order_seq_cst and __opencl_c_atomic_scope_device
features."
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