[strong] Implement per-object restrictions behaviour of property freezing
Implements the strong mode proposal's restrictions on changing a strong object's writable, non-configurable property to non-writable. Setting the strong bit is still wip, so this change will only affect those objects that have the bit correctly set. The tests reflect this, and will be expanded as more objects can be marked as strong. BUG=v8:3956 LOG=N Review URL: https://codereview.chromium.org/1142393003 Cr-Commit-Position: refs/heads/master@{#28698}
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