Implement a new JIT for Arm devices

src/Ryujinx.Cpu/LightningJit/CodeGen/Operand.cs

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+using System.Diagnostics;
+
+namespace Ryujinx.Cpu.LightningJit.CodeGen
+{
+    struct Operand
+    {
+        public readonly OperandKind Kind { get; }
+        public readonly OperandType Type { get; }
+        public readonly ulong Value { get; }
+
+        public Operand(OperandKind kind, OperandType type, ulong value)
+        {
+            Kind = kind;
+            Type = type;
+            Value = value;
+        }
+
+        public Operand(int index, RegisterType regType, OperandType type) : this(OperandKind.Register, type, (ulong)((int)regType << 24 | index))
+        {
+        }
+
+        public Operand(OperandType type, ulong value) : this(OperandKind.Constant, type, value)
+        {
+        }
+
+        public readonly Register GetRegister()
+        {
+            Debug.Assert(Kind == OperandKind.Register);
+
+            return new Register((int)Value & 0xffffff, (RegisterType)(Value >> 24));
+        }
+
+        public readonly int AsInt32()
+        {
+            return (int)Value;
+        }
+    }
+}