const runtime.traceEvUserRegion

2 uses

	runtime (current package)
		trace.go#L70: 	traceEvUserRegion        = 47 // trace.WithRegion [timestamp, internal task id, mode(0:start, 1:end), stack, name string]
		trace.go#L1197: 	traceEventLocked(0, mp, pid, bufp, traceEvUserRegion, 3, id, mode, nameStringID)