io: prevent write to PipeWriter after Close
Return an ErrClosedPipe rather than allowing the write to proceed. Fixes #5330. R=golang-dev, rsc CC=golang-dev https://golang.org/cl/12541053
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Return an ErrClosedPipe rather than allowing the write to proceed. Fixes #5330. R=golang-dev, rsc CC=golang-dev https://golang.org/cl/12541053