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Commit 15410e98 authored by Tim Northover's avatar Tim Northover
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AArch64: remove barriers from AArch64 atomic operations. 

I've managed to convince myself that AArch64's acquire/release
instructions are sufficient to guarantee C++11's required semantics,
even in the sequentially-consistent case.

llvm-svn: 179005
parent c224e25d
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