const runtime.stackFork

4 uses

	runtime (current package)
		proc.go#L4925: 	gp.stackguard0 = stackFork
		signal_unix.go#L485: 	if gp.stackguard0 == stackFork {
		stack.go#L134: 	stackFork = uintptrMask & -1234
		stack.go#L969: 	if thisg.m.morebuf.g.ptr().stackguard0 == stackFork {