const runtime.stackSystem

4 uses

	runtime (current package)
		proc.go#L5022: 		stacksize = round2(stackSystem + stacksize)
		stack.go#L72: 	stackSystem = goos.IsWindows*4096 + goos.IsPlan9*512 + goos.IsIos*goarch.IsArm64*1024
		stack.go#L79: 	fixedStack0 = stackMin + stackSystem
		stack.go#L99: 	stackGuard = stackNosplit + stackSystem + abi.StackSmall