[turbofan] Analysis of the broker Refs distribution
This analysis shows the number of used/unused refs as well as their by-type distribution and outputs the broker zone memory. It introduces a new flag --trace-heap-broker-memory. Doc: https://docs.google.com/document/d/1oUMxlC2YbficEVkQ1X8TK9WNCWRmLqzDRFy4z3cJsII/edit#heading=h.3sde9siqk2yw Bug: v8:9720 Change-Id: I4fafc225134d0548e976ce00d67bd5cabeda60c3 Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/1849526 Commit-Queue: Maya Lekova <mslekova@chromium.org> Reviewed-by: Georg Neis <neis@chromium.org> Cr-Commit-Position: refs/heads/master@{#64269}
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