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

cmd/gasm/debug_linux.go

@@ -150,7 +150,7 @@ REPL commands:
 						// Find the buffer size from the spec.
 						size := parseBufSize(*bufSpec, name)
 						// Length at offset+8, capacity at offset+16.
-						for j := 0; j < 8; j++ {
+						for j := range 8 {
 							argBlock[off+8+j] = byte(size >> (j * 8))
 							argBlock[off+16+j] = byte(size >> (j * 8))
 						}
@@ -260,7 +260,7 @@ REPL commands:
 // Format: name:size:pattern[,name:size:pattern...]
 func parseBufNames(spec string) []string {
 	var names []string
-	for _, part := range strings.Split(spec, ",") {
+	for part := range strings.SplitSeq(spec, ",") {
 		fields := strings.SplitN(part, ":", 3)
 		if len(fields) >= 1 && fields[0] != "" {
 			names = append(names, fields[0])
@@ -271,7 +271,7 @@ func parseBufNames(spec string) []string {
 
 // parseBufSize extracts the size of a named buffer from a buffer specification.
 func parseBufSize(spec, name string) int {
-	for _, part := range strings.Split(spec, ",") {
+	for part := range strings.SplitSeq(spec, ",") {
 		fields := strings.SplitN(part, ":", 3)
 		if len(fields) >= 2 && fields[0] == name {
 			var size int