Implement UnsafeAtomics.fence #19
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Mostly using LLVM fence intrinsic (since we require julia 1.10 that's thankfully directly accesible),
but on x86 we have observed that on Zen systems LLVM choice of fence is slow.
x-ref: llvm/llvm-project#106555
The PR above is backported to our version of LLVM 19 JuliaLang/llvm-project@49c6812
but not yet in mainline Julia.
Closes #16