[heap] Add linear ephemeron marking
After a certain number of iterations in the fixpoint iteration switch to a linear algorithm. This algorithm uses a key-to-values map for weak collections contents to avoid checking all EphemeronHashTables again. Bug: chromium:844008 Change-Id: I044fede5911e0a780d088d1ba2bb5343317d9b7a Reviewed-on: https://chromium-review.googlesource.com/1105835 Commit-Queue: Dominik Inführ <dinfuehr@google.com> Reviewed-by: Ulan Degenbaev <ulan@chromium.org> Cr-Commit-Position: refs/heads/master@{#54232}
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