[runtime] AsyncFromSyncIterator closes the underlying iterator before rejecting #72
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Summary
In tc39/ecma262#2600 AsyncFromSyncIterator was changed to close the underlying sync iterator before rejecting in some cases.
In addition if in
AsyncFromSyncIterator.prototype.throwthe underlying sync iterator does not have athrowmethod, threw a new TypeError.Tests
Fixes all failing AsyncFromSyncIteratorPrototype test262 tests.