/** Uses an {@link EnumSet} to store value collections. */
    public <V0 extends Enum<V0>> SetMultimapBuilder<K0, V0> enumSetValues(Class<V0> valueClass) {
      checkNotNull(valueClass, "valueClass");
      return new SetMultimapBuilder<K0, V0>() {
        @Override
        public <K extends K0, V extends V0> SetMultimap<K, V> build() {
          // V must actually be V0, since enums are effectively final

	gcm256CipherID     = "******@****.***"
	aes128cbcID        = "aes128-cbc"
	tripledescbcID     = "3des-cbc"
)

// https://cs.opensource.google/go/x/crypto/+/refs/tags/v0.22.0:ssh/common.go;l=46
// preferredKexAlgos specifies the default preference for key-exchange
// algorithms in preference order. The diffie-hellman-group16-sha512 algorithm

	VMNH	V1, V2, V30             // e7e1200018fe
	VERLLVF	V2, V30, V27            // e7be20002c73
	VSCBIB	V0, V23, V24            // e78700000cf5
	VN	V2, V1, V0              // e70210000068
	VNC	V2, V1, V0              // e70210000069
	VO	V2, V1, V0              // e7021000006a
	VX	V2, V1, V0              // e7021000006d
	VN	V16, V1                 // e71010000468
	VNC	V16, V1                 // e71010000469

	UMULL R19, R22, R19                        // d37eb39b
	UXTBW R2, R6                               // 461c0053
	UXTHW R7, R20                              // f43c0053
	VCNT V0.B8, V0.B8                          // 0058200e
	VCNT V0.B16, V0.B16                        // 0058204e
	WFE                                        // 5f2003d5
	WFI                                        // 7f2003d5

		if 0 <= n && n <= 31 {
			return arm64.REG_F0 + n, true
		}
	case "R":
		if 0 <= n && n <= 30 { // not 31
			return arm64.REG_R0 + n, true
		}
	case "V":
		if 0 <= n && n <= 31 {
			return arm64.REG_V0 + n, true
		}
	}
	return 0, false
}

// ARM64RegisterShift constructs an ARM64 register with shift operation.
func ARM64RegisterShift(reg, op, count int16) (int64, error) {

	var xl xlMetaV2
	err := xl.Load(data)
	if err != nil {
		t.Fatal(err)
	}
	v0 := xl.versions[0]

	// Saved with signature 0xfe, 0x54, 0xbc, 0x2f
	// Signature must be converted after load.
	wantSig := [4]byte{0x1e, 0x5f, 0xba, 0x4a}
	if v0.header.Signature != wantSig {
		t.Errorf("Wrong signature, want %#v, got %#v", wantSig, v0.header.Signature)
	}
	v, err := xl.getIdx(0)
	if err != nil {
		t.Fatal(err)
	}

	VUXTL2	V20.B8, V21.H8                                   // ERROR "operand mismatch"
	VUXTL	V3.D2, V4.B8                                     // ERROR "operand mismatch"
	VUZP1	V0.B8, V30.B8, V1.B16                            // ERROR "operand mismatch"
	VUZP2	V0.Q1, V30.Q1, V1.Q1                             // ERROR "invalid arrangement"
	VUSHLL	$0, V30.D2, V30.H8                               // ERROR "operand mismatch"

			if err != nil {
				return nil, err
			}
			b, _, minor, err := checkXL2V1(b)
			if err != nil {
				return nil, err
			}
			filemap[file] = make(map[string]string)
			buf := bytes.NewBuffer(nil)
			v0 := ""
			var data xlMetaInlineData
			switch minor {
			case 0:
				_, err = msgp.CopyToJSON(buf, bytes.NewReader(b))
				if err != nil {
					return nil, err
				}
			case 1, 2:

	register["R18_PLATFORM"] = register["R18"]
	delete(register, "R18")
	for i := arm64.REG_F0; i <= arm64.REG_F31; i++ {
		register[obj.Rconv(i)] = int16(i)
	}
	for i := arm64.REG_V0; i <= arm64.REG_V31; i++ {
		register[obj.Rconv(i)] = int16(i)
	}

	// System registers.
	for i := 0; i < len(arm64.SystemReg); i++ {
		register[arm64.SystemReg[i].Name] = arm64.SystemReg[i].Reg
	}

	{"VS54", "VS54"},
	{"VS55", "VS55"},
	{"VS56", "VS56"},
	{"VS57", "VS57"},
	{"VS58", "VS58"},
	{"VS59", "VS59"},
	{"VS60", "VS60"},
	{"VS61", "VS61"},
	{"VS62", "VS62"},
	{"VS63", "VS63"},
	{"V0", "V0"},
	{"V1", "V1"},
	{"V2", "V2"},
	{"V3", "V3"},
	{"V4", "V4"},
	{"V5", "V5"},
	{"V6", "V6"},
	{"V7", "V7"},
	{"V8", "V8"},
	{"V9", "V9"},
	{"V10", "V10"},
	{"V11", "V11"},