Establish an invariant on initial maps:
1) they always own descriptors, 2) the number of own descriptors is equal to the number of descriptors in the descriptor array. This allows an initial map of a subclass to share descriptor array with initial map of the parent class (if it already contains properties). BUG=chromium:551430 LOG=N Review URL: https://codereview.chromium.org/1411933005 Cr-Commit-Position: refs/heads/master@{#31892}
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