Restrict atomic_ref types in accordance with the spec #32
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I ran into this while developing some code with SimSYCL and then executing it on other platforms.
SimSYCL (helpfully, and, in my opinion, unproblematically) allows
atomic_ref<bool>, but the spec does not.It's easier to fix SimSYCL for now than the spec.
While implementing this we also found that it's currently very strange for the spec to list a limited set of types -- specifically not including any pointers -- but also a specialization for pointers. Some clarification seems needed there.