Implements the strong mode proposal's restrictions on the ability of user code
to modify the prototype of strong objects.

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/1143623002

Cr-Commit-Position: refs/heads/master@{#28664}