High level comments:
1. We have a perf test for maps. We should add a new case for objects as
keys.
2. I assume the change to Isolate::IsInternallyUsedPropertyName makes us
able to
add this property to non extensible objects? (Needs tests?)
3. One drawback with this is that adding an object to a map now causes a Map
transition and your previously monomorphic code becomes polymorphic.
https://codereview.chromium.org/1142493002/
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