Andreas Kling f897c41092 LibJS: Implement basic support for the "delete" operator ...

It turns out "delete" is actually a unary op :)
This patch implements deletion of object properties, it doesn't yet
work for casually deleting properties from the global object.

When deleting a property from an object, we switch that object to
having a unique shape, no longer sharing shapes with others.
Once an object has a unique shape, it no longer needs to care about
shape transitions.

2020-04-26 15:51:07 +02:00

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