[wasm-reduce] Reduce struct.new arguments away when possible #7118
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If all the fields of a
struct.new
are defaultable, see if replacing it with astruct.new_default
preserves the behavior, and reduce that way if so.Also add a missing
--closed-world
to the--remove-unused-types
invocation. Without that, it was erroring and not working, which I
noticed when testing this. The test also checks that.