[CIR][AMDGPU][OpenCL] Classify __hip_atomic_*/__opencl_atomic_* operations (#220856)
load, store, exchange, compare_exchange_strong/weak, and every fetch op
were missing from the operand-classification switches, so they fell to
the default and reported an unimplemented atomic. They take the same
operands as their __c11_atomic_*/__atomic_* counterparts, so they belong
with them.
This is the ground work for implementing more AMDGPU atomics.
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Signed-off-by: Steffen Holst Larsen <sholstla@amd.com>