x/build: use rr-project.org for running Go builds/tests on Linux? #45219
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Someone must examine and confirm this is a valid issue and not a duplicate of an existing one.
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We have a lot of intermittent failures on the builders, which are hard to reproduce. Evidently the Firefox project had similar struggles, so they built https://rr-project.org/, which allows recording and replaying program executions on linux/x86. Perhaps we should look into using it for our builders too?
Quickly skimming build.golang.org, it's not clear to me if there are enough flaky failures on linux/x86 to warrant the ~20% slowdown (according to their website). It seems like most flakiness is on non-linux or non-x86, unfortunately, and rr doesn't currently support any other platforms.
Maybe the regabi builder could benefit from it at least. It seems to have had some flakiness a couple weeks ago.
/cc @aclements @bcmills
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