Prevent throwing in running generator #19327
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Generator::throw()on a running generator is not allowed. It throws "Cannot resume an already running generator" when trying to resume the generator to handle the provided exception.However, when calling
Generator::throw()on a generator with a non-Generator delegate, we release the delegate regardless. If a Fiber was suspended in the delegate, this causes use after frees when the Fiber is resumed.Fix this by throwing "Cannot resume an already running generator" earlier.
Fixes GH-19326.