[squirrelfish] inlining scopechainnode into scope objects

[Geoffrey Garen]

>  JSScopeObject: A new base class, holding the next pointer, global
>    object, and global this
> 
>    + JSDynamicScope: A new class, wrapping "with" objects in the scope.

I'd prefer to be more specific: "JSWithScope".

>    + JSVariableObject

Even though the spec uses the phrase "variable object", I think we should move to something clearer and more consistent with your other naming: "JSVarScope".

>      + JSStaticScopeObject

I'd prefer to be more specific: "JSLetScope". There's one special case (catch blocks) where, logically, the engine implies the let statement for you. But I don't think that justifies an abstract name.

In general, you can remove "Object" from the class names above. Every object is an object.

>      + JSActivation
> 
>      + JSGlobalObject
> 
> Anyway, now my question: what is the deal with the "globalThis" object?
> Specifically, does it exist in a 1-to-1 relationship with the global
> object?

For any give JSGlobalObject, there is only one globalThis.

Geoff