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stream: prevent object map change in ReadableState

Rodrigo Muino Tomonari requested to merge github/fork/evanlucas/readabledeopt into master

ReadableState has the resumeScheduled property that helps determine if a stream should be resumed. It was not assigned in the constructor. When stream.resume is called on a readable stream that is not flowing, it is set to true. This changes the property map of the ReadableState which can cause a deopt in onEofChunk and needMoreData.

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