Merge branch 'jk/lsan-race-ignore-false-positive'

CI jobs that run threaded programs under LSan has been giving false positives from time to time, which has been worked around. This is an alternative to the jk/lsan-race-with-barrier topic with much smaller change to the production code. * jk/lsan-race-ignore-false-positive: test-lib: ignore leaks in the sanitizer's thread code test-lib: check leak logs for presence of DEDUP_TOKEN test-lib: simplify leak-log checking test-lib: rely on logs to detect leaks Revert barrier-based LSan threading race workaround