Move solution and projects to src

src/ARMeilleure/IntermediateRepresentation/Register.cs

@@ -0,0 +1,43 @@
+using System;
+
+namespace ARMeilleure.IntermediateRepresentation
+{
+    readonly struct Register : IEquatable<Register>
+    {
+        public int Index { get; }
+
+        public RegisterType Type { get; }
+
+        public Register(int index, RegisterType type)
+        {
+            Index = index;
+            Type  = type;
+        }
+
+        public override int GetHashCode()
+        {
+            return (ushort)Index | ((int)Type << 16);
+        }
+
+        public static bool operator ==(Register x, Register y)
+        {
+            return x.Equals(y);
+        }
+
+        public static bool operator !=(Register x, Register y)
+        {
+            return !x.Equals(y);
+        }
+
+        public override bool Equals(object obj)
+        {
+            return obj is Register reg && Equals(reg);
+        }
+
+        public bool Equals(Register other)
+        {
+            return other.Index == Index &&
+                   other.Type  == Type;
+        }
+    }
+}