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jkummerow authored
In general, deleting a property from a fast-properties object requires transitioning the object to dictionary mode. However, when the most-recently-added property is deleted, we can simply roll back the last map transition that the object went through. This is a performance experiment: it should make things faster, but if it turns out to have more negative than positive impact, we will have to revert it. TBR=bmeurer@chromium.org (just adding a comment) Review-Url: https://codereview.chromium.org/2830093002 Cr-Commit-Position: refs/heads/master@{#44799}
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