style: modernize to splitseq, cut, min, maps.copy and range-over-int

debug/watchpoint_linux_amd64.go

@@ -26,7 +26,7 @@ var wpSlots [4]bool
 // FindFreeWatchpointSlot returns the index of the first free watchpoint slot
 // (0-3), or -1 if all four hardware watchpoints are in use.
 func (s *Session) FindFreeWatchpointSlot() int {
-	for i := 0; i < 4; i++ {
+	for i := range 4 {
 		if !wpSlots[i] {
 			return i
 		}
@@ -122,7 +122,7 @@ func (s *Session) ClearWatchpoint(slot int) error {
 
 // ClearAllWatchpoints removes all hardware watchpoints.
 func (s *Session) ClearAllWatchpoints() error {
-	for slot := 0; slot < 4; slot++ {
+	for slot := range 4 {
 		if wpSlots[slot] {
 			if err := s.ClearWatchpoint(slot); err != nil {
 				return err