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

asm/goobj_resolve.go

@@ -323,8 +323,8 @@ func splitQualified(full string) (pkg, name string) {
 	if idx := strings.IndexByte(full, '\u00b7'); idx >= 0 {
 		return full[:idx], full[idx+len("\u00b7"):]
 	}
-	if idx := strings.IndexByte(full, '.'); idx >= 0 {
-		return full[:idx], full[idx+1:]
+	if before, after, ok := strings.Cut(full, "."); ok {
+		return before, after
 	}
 	return "", full
 }