Use NO_DYNAMIC_PROPERTIES for Closure

Instead of manually implementing this, use the standard mechanism.
This has minor behavior changes (e.g. doing an isset() will now
return false

Use NO_DYNAMIC_PROPERTIES for Closure

Instead of manually implementing this, use the standard mechanism.
This has minor behavior changes (e.g. doing an isset() will now
return false instead of throwing) which are more in line with
typical behavior.

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Fix use-after-free when trying to write to closure property