Andreas Kling 2d4eb40f59 LibJS: Add the CreateMappedArgumentsObject abstract operation ...

This patch adds a new ArgumentsObject class to represent what the spec
calls "Arguments Exotic Objects"

These are constructed by the new CreateMappedArgumentsObject when the
`arguments` identifier is resolved in a callee context.

The implementation is incomplete and doesn't yet support mapping of
the parameter variables to the indexed properties of `arguments`.

2021-06-28 16:52:20 +02:00

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