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

cmd/gasm/scaffold.go

@@ -136,7 +136,7 @@ type sigResult struct {
 // parseSig parses the // func signature of a doc comment.
 func parseSig(doc string) ([]sigParam, []sigResult, bool) {
 	var line string
-	for _, l := range strings.Split(doc, "\n") {
+	for l := range strings.SplitSeq(doc, "\n") {
 		if t := strings.TrimSpace(l); strings.HasPrefix(t, "func ") {
 			line = t
 			break