Andreas Kling 8286f8b996 LibJS: Add property configuration transitions ...

Object.defineProperty() can now change the attributes of a property
already on the object. Internally this becomes a shape transition with
the TransitionType::Configure. Such transitions don't expand the
property storage capacity, but rather simply keep attributes up to date
when generating a property table.

2020-04-10 00:36:06 +02:00

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