Add `rr` to linux CI machines

[vtjnash]

If the underlying hardware and VM supports it (https://github.com/rr-debugger/rr#system-requirements), it would be amazing to have rr installed on these machines by default from https://github.com/rr-debugger/rr/compare/master...Keno:kf/forci8, run the test step under rr record --nested=detach, and then upload the result artifacts (e.g. from rr pack) somewhere for a couple days for ready downloading and debugging. There are pre-built binaries that might even work everywhere already available at https://github.com/JuliaBinaryWrappers/rr_jll.jl/releases

This would likely allow us to quickly solve a couple remaining intermittent issues in libuv. While I could possibly alter the libuv build files to run under rr manually, if they can detect that the machine has support, the making of rr files available to everyone who are using this CI system might be so much better!

[mmarchini]

is that a libuv-specific request? I think rr wouldn't provide much value to Node.js (with the exception of maybe cctests)

[vtjnash]

I do mostly work on libuv. However rr supports nodejs and V8 directly also, and can be used for JavaScript debugging. I had sent this idea to one of the rr developers and they replied: It makes even more sense for nodejs proper [relative to other CI systems I help support that use rr], because pernosco has V8 integration. (Referring there to the post-rr visualization tool here: https://robert.ocallahan.org/2020/05/omniscient-js-debugging-in-pernosco.html?m=1)

[mhdawson]

From the docs > (VMware and KVM are known to work; Xen does not.)

I'm not sure we know what hypervisors are used by our hosting providers.

While I could possibly alter the libuv build files to run under rr manually

That might be a good first step, both to show what would be needed in the build jobs as well as test out across our providers.

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