llvm dev - Dec 2020 - AArch64 enabling out-of-line atomics by default

Hi all,
I am going to enable outline atomics "-moutline-atomics" by default
for baseline AArch64 architecture.
This will allow AArch64 generic compiled code to take advantage of LSE
instructions when they are available.
You can always disable outline atomics specifying
"-mno-outline-atomics" option.
If you have any concerns please reply here or follow up in review:
https://reviews.llvm.org/D93585
Best regards,
Pavel
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