[Merge] ~dipietro-salvatore/ubuntu/+source/nginx:arm64-moutline-atomics into ubuntu/+source/nginx:ubuntu/focal-security

[git-ubuntu bot]

You have been requested to review the proposed merge of ~dipietro-salvatore/ubuntu/+source/nginx:arm64-moutline-atomics into ubuntu/+source/nginx:ubuntu/focal-security.

For more details, see:
https://code.launchpad.net/~dipietro-salvatore/ubuntu/+source/nginx/+git/nginx/+merge/434825

Add "-moutline-atomics" cflag for arm64 architecture since it is not active by default on GCC 9. Without this flag, the CPU doesn't use atomics instructions resulting in poor performance and CPU saturation. With this change, NGINX does not produce STREX failing operations anymore (observable with perf tool).

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Your team Ubuntu Sponsors Team is requested to review the proposed merge of ~dipietro-salvatore/ubuntu/+source/nginx:arm64-moutline-atomics into ubuntu/+source/nginx:ubuntu/focal-security.
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