[turbofan] Eliminate redundant elements kind transitions.
A TransitionElementsKind operation is redundant if we already know that the object has the target_map (independent of what the source_map might be). R=yangguo@chromium.org Review-Url: https://codereview.chromium.org/2233403003 Cr-Commit-Position: refs/heads/master@{#38597}
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