style: purge em dashes from the produced text

Assisted-by: GLM 5.3 Flash

parser/parser_test.go

@@ -149,7 +149,7 @@ func TestOperandStructure(t *testing.T) {
 		}
 	}
 
-	// MOVQ swin_base+0(FP), SI — the first MOVQ in the body.
+	// MOVQ swin_base+0(FP), SI; the first MOVQ in the body.
 	var mov *ast.Instr
 	for _, s := range fn.Body {
 		if in, ok := s.(*ast.Instr); ok && in.Mnemonic.Text == "MOVQ" {
@@ -202,7 +202,7 @@ func TestAVX512Operands(t *testing.T) {
 		}
 	}
 
-	// VALIGND $15, Z9, Z0, Z1 — four operands.
+	// VALIGND $15, Z9, Z0, Z1; four operands.
 	val := byMnem["VALIGND"]
 	if val == nil {
 		t.Fatal("VALIGND not found")
@@ -224,7 +224,7 @@ func TestAVX512Operands(t *testing.T) {
 		t.Errorf("VMOVDQU32 dst = %+v, want 4(SI)(AX*1)", dst)
 	}
 
-	// KTESTW K1, K1 — mask registers parse as bare names.
+	// KTESTW K1, K1; mask registers parse as bare names.
 	kt := byMnem["KTESTW"]
 	if kt == nil || len(kt.Operands) != 2 {
 		t.Fatalf("KTESTW = %+v, want two operands", kt)