Detect if 8-bit atomics are available.
In some rare cases (older compiler, e.g. gcc 4.2 w/ MIPS), 8-bit atomics might be unavailable. Detect such cases so that we can workaround.
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In some rare cases (older compiler, e.g. gcc 4.2 w/ MIPS), 8-bit atomics might be unavailable. Detect such cases so that we can workaround.