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Commit d167d428 authored by Reid Kleckner's avatar Reid Kleckner
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[AArch64] Advertise that the __sync_*_compare_and_swap_1/2/4/8 builtins work 

Fixes PR23428, where std::thread in libstdc++ would go haywire without
these defines.

llvm-svn: 236605
parent 1fe0d5ca
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