Avoid resolving the Adler32Imp to use multiple times.
#17
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This resolves the implementation to use once, storing it in an AtomicPtr. This avoids multiple calls to
std::is_blah_feature_detected!, and avoids all unnecessary branching (because the AtomicPtr starts out initialized to the function that resolves and updates the AtomicPtr itself). This is similar to how the GCCifuncfeature works in C, but done manually.