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

debug/disasm_linux_amd64.go

@@ -7,6 +7,7 @@ package debug
 
 import (
 	"fmt"
+	"strings"
 
 	"golang.org/x/arch/x86/x86asm"
 )
@@ -34,19 +35,19 @@ func (s *Session) Disassemble(addr uint64) (string, int, error) {
 // DisassembleN decodes up to n instructions starting at addr and returns
 // them as a formatted string with addresses and byte offsets.
 func (s *Session) DisassembleN(addr uint64, n int) string {
-	var result string
+	var result strings.Builder
 	pc := addr
 	for range n {
 		text, length, err := s.Disassemble(pc)
 		if err != nil {
-			result += fmt.Sprintf("  %#08x: <error: %v>\n", pc, err)
+			result.WriteString(fmt.Sprintf("  %#08x: <error: %v>\n", pc, err))
 			break
 		}
-		result += fmt.Sprintf("  %#08x: %s\n", pc, text)
+		result.WriteString(fmt.Sprintf("  %#08x: %s\n", pc, text))
 		if length == 0 {
 			length = 1
 		}
 		pc += uint64(length)
 	}
-	return result
+	return result.String()
 }