[llvm-branch-commits] [llvm] [compiler-rt] [ci] Set timeout for individual tests and report slowest tests (PR #76300)

[Vitaly Buka via llvm-branch-commits]

https://github.com/vitalybuka created https://github.com/llvm/llvm-project/pull/76300

There are builds like
https://buildkite.com/llvm-project/github-pull-requests/builds/24894

It looks like a deadlock in a test, but we can't see which one.
`--timeout=` will make lit kill and report such tests.

`--time-tests` produces nice report about slowest test, so we can tune
them over time.