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a16b4dd9a4
This commit removes shims, where possible, for `structural` items.
Instead of generating code that looks like:
const target = function() { this.foo(); };
exports.__wbg_thing = function(a) { target.call(getObject(a)); };
we now instead generate:
exports.__wbg_thing = function(a) { getObject(a).foo(); };
Note that this only applies to `structural` bindings, all default
bindings (as of this commit) are still using imported targets to ensure
that their binding can't change after instantiation.
This change was [detailed in RFC #5][link] as an important optimization
for `structural` bindings to ensure they've got performance parity with
today's non-`structural` default bindings.
[link]: https://rustwasm.github.io/rfcs/005-structural-and-deref.html#why-is-it-ok-to-make-structural-the-default
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