Expand std::atomic feature tests to include compare_exchange, fetch_add, etc.
#1315
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…dd, etc. E.g. clang 18 with libstdc++ 14 can do loads and stores of 128-bit atomics without libatomic, but can't do compare_exchange without libatomic. libatomic does not seem to support 128-bit fetch_add/sub, but we don't need it so leave it out of the 128-bit feature test.
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Needed for #1314.