const runtime.traceEvGoBlock

2 uses

	runtime (current package)
		traceevent.go#L52: 	traceEvGoBlock             // goroutine blocks [timestamp, reason, stack ID]
		traceruntime.go#L488: 	tl.eventWriter(traceGoRunning, traceProcRunning).commit(traceEvGoBlock, traceArg(trace.goBlockReasons[tl.gen%2][reason]), tl.stack(skip))