[heap] Make survival counters concurrent (atomic)
Those counters will be incremented concurrently during parallel evacuation of newspace. This change makes sure we do the updates atomically. Note that actual reasoning about them happens sequentially on the main thread. BUG=chromium:524425 LOG=N R=ulan@chromium.org Review URL: https://codereview.chromium.org/1585843010 Cr-Commit-Position: refs/heads/master@{#33326}
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