feat(arch): the SVE2.1 Z-alias permutations and copies

Assisted-by: GLM 5.3 Flash

asm/extension_test.go

@@ -221,12 +221,64 @@ func TestExtensionNamesARM64(t *testing.T) {
 		"PRDFFR", "PRDFFRS", "PWRFFR", "PREV", "SETFFR",
 		"PWHILEGE", "PWHILEGT", "PWHILEHI", "PWHILEHS",
 		"PWHILELE", "PWHILELO", "PWHILELS", "PWHILELT", "PWHILERW", "PWHILEWR",
+		// The SVE2.1 Z-alias families, in first-occurrence order.
+		"ZABS",
+		"ZREVB",
+		"ZREVH",
+		"ZSXTB",
+		"ZSXTH",
+		"ZUXTB",
+		"ZUXTH",
+		"ZADD",
+		"ZAND",
+		"ZBIC",
+		"ZCLS",
+		"ZCLZ",
+		"ZCNT",
+		"ZCOMPACT",
+		"ZDUP",
+		"ZEOR",
+		"ZEXPAND",
+		"ZINSR",
+		"ZLASTA",
+		"ZLASTB",
+		"ZMOVPRFX",
+		"ZREVD",
+		"ZREVW",
+		"ZSXTW",
+		"ZUXTW",
+		"ZNEG",
+		"ZNOT",
+		"ZORR",
+		"ZRBIT",
+		"ZREV",
+		"ZSEL",
+		"ZSQABS",
+		"ZSQNEG",
+		"ZSUB",
+		"ZSUBR",
+		"ZSUNPKHI",
+		"ZSUNPKLO",
+		"ZTBX",
+		"ZTBXQ",
+		"ZTRN1",
+		"ZTRN2",
+		"ZUUNPKHI",
+		"ZUUNPKLO",
+		"ZUZP1",
+		"ZUZP2",
+		"ZUZPQ1",
+		"ZUZPQ2",
+		"ZZIP1",
+		"ZZIP2",
+		"ZZIPQ1",
+		"ZZIPQ2",
 	}
 	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 != 77 {
-		t.Errorf("the family registers %d instructions, want 77", n)
+	if n := len(arch.Extensions(arch.ARM64)); n != 167 {
+		t.Errorf("the family registers %d instructions, want 164", n)
 	}
 }