[test] Run heavy tests sequentially
This adds a new status file indicator "HEAVY" to mark tests with high resource demands. There will be other tests running in parallel, but only a limited number of other heavy tests. The limit is controlled with a new parameter --max-heavy-tests and defaults to 1. The change also marks a variety of tests as heavy that recently had flaky timeouts. Heavy also implies slow, hence heavy tests are executed at the beginning with a higher timeout like other slow tests. The implementation is encapsulated in the test-processor chain. A new processor buffers heavy tests in a queue and adds buffered tests only if other heavy tests have ended their computation. Bug: v8:5861 Change-Id: I89648ad0030271a3a5af588ecc9c43285b728d6d Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/2905767 Commit-Queue: Michael Achenbach <machenbach@chromium.org> Reviewed-by: Liviu Rau <liviurau@chromium.org> Cr-Commit-Position: refs/heads/master@{#74712}
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