Which library in the Android NDK implements the "__sync_synchronize" function

[Horácio Filho]

Hello,

Please could someone here tell me which library in the Android NDK 27 implements the "__sync_synchronize" function? I have tested the "libclang_rt.builtins-arm-android.a" library, but it is not the answer here, unfortunately. 

Obrigado.

[enh]

it should become a single inline instruction on all of our supported
architectures (`dmb ish` on arm64, say) --- no need for a function.

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