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Since `props.x` is a possibly megamorphic access, it can be slow to access and trigger recompilation. When we are looping over the props and pattern matching every key, anyway, we've already done this work. We can just reuse the same value by stashing it outside the loop in the stack. This only makes sense for updates in diffInCommitPhase since otherwise we don't have the full set of props in that loop. We also have to be careful not to skip over equal values since we need to extract them anyway. DiffTrain build for commit https://github.com/facebook/react/commit/6b90976bc10f325146b193286435a4b5015ef605.