runtime: convert closechan/chanlen/chancap to Go
LGTM=bradfitz, rsc R=golang-codereviews, bradfitz, rsc CC=golang-codereviews https://golang.org/cl/135150043
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LGTM=bradfitz, rsc R=golang-codereviews, bradfitz, rsc CC=golang-codereviews https://golang.org/cl/135150043