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This removes the non-standard `hasInstance` proxy trap. All objects will now use the algorithm in `JS::InstanceofOperator`. That function uses other primitives and proxy traps already available to JS code. As discussed in the bug, there's a minor difference in behavior: for `xrayWrapper instanceof xrayWaiver` we used to always return false but we can now invoke `xrayWaiver[Symbol.hasInstance]()`. Differential Revision: https://phabricator.services.mozilla.com/D142061