Implemented addition

src/build/asm/Mnemonic.go

@@ -4,17 +4,30 @@ type Mnemonic uint8
 
 const (
 	NONE Mnemonic = iota
+	ADD
+	CALL
+	JUMP
+	LABEL
 	MOVE
 	RETURN
 	SYSCALL
-	LABEL
-	CALL
-	JUMP
 )
 
 // String returns a human readable version.
 func (m Mnemonic) String() string {
 	switch m {
+	case ADD:
+		return "add"
+
+	case CALL:
+		return "call"
+
+	case JUMP:
+		return "jump"
+
+	case LABEL:
+		return "label"
+
 	case MOVE:
 		return "move"
 
@@ -23,15 +36,6 @@ func (m Mnemonic) String() string {
 
 	case SYSCALL:
 		return "syscall"
-
-	case LABEL:
-		return "label"
-
-	case CALL:
-		return "call"
-
-	case JUMP:
-		return "jump"
 	}
 
 	return "NONE"