[Wasm GC] Effects: Differentiate Struct and Array types (#4088)

This allows common patterns in J2CL to be optimized, where we write
to various array indices and get the values or the reference from a
struct.

It would be nice to do even better here, and look at actually specific
types, but I think we should be careful to keep the runtime constant.
That seems hard to do if we accumulate a list of types and do
Type::isSubType on them etc. But maybe someone has a better
idea than this PR?

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