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Missing test for async function where @@species is not called #740

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@littledan

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@littledan

V8 initially used a naive implementation of async/await which just called the original value of Promise.prototype.then to chain things together. However, this is incorrect, as it uses @@species. Maybe we should have a test in test262 that asserts that this is not accessed, as it seems like a likely bug to run into. bug fix @caitp

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