feat(arch): the same-size shift-immediate family

Assisted-by: GLM 5.3 Flash

asm/extension_test.go

@@ -516,12 +516,19 @@ func TestExtensionNamesARM64(t *testing.T) {
 		"ZSQSHL",
 		"ZSQSHLU",
 		"ZUQSHL",
+		"ZSRI",
+		"ZSSRA",
+		"ZUSRA",
+		"ZSRSRA",
+		"ZURSRA",
+		"ZASRD",
+		"ZXAR",
 	}
 	got := ExtensionNames(arch.ARM64)
 	if strings.Join(got, ",") != strings.Join(want, ",") {
 		t.Errorf("ExtensionNames(ARM64) = %v, want %v", got, want)
 	}
-	if n := len(arch.Extensions(arch.ARM64)); n != 528 {
-		t.Errorf("the family registers %d instructions, want 528", n)
+	if n := len(arch.Extensions(arch.ARM64)); n != 537 {
+		t.Errorf("the family registers %d instructions, want 537", n)
 	}
 }