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[builtins][AArch64] Implement _sync out-of-line atomics
Whilst Clang does not use these, recent GCC does, and so on systems such
as FreeBSD that wish to use compiler-rt as the system runtime library
but also wish to support building programs with GCC these interfaces are
needed.
This is a light adaptation of the code committed to GCC by Sebastian Pop
<spop@amazon.com>, relicensed with permission for use in compiler-rt.
Fixes https://github.com/llvm/llvm-project/issues/63483
Reviewed By: sebpop, MaskRay
Differential Revision: https://reviews.llvm.org/D158536
Reviewed by: dim
MFC after: 1 week
Differential Revision: https://reviews.freebsd.org/D41716
(cherry picked from commit
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